Gabriel Diaz de Tudanca is a 19-year-old Spaniard who, although born a girl, identified as male from early childhood. "When I was three years old I came back from school and said to my mother that when I grew up I was going to be a man called Oscar," he says. Supported by his family and friends, he has undergone surgery and hormone treatments, changed his name and renewed his identity documents to reflect what he feels is his true gender. Reuters photographer Susana Vera accompanied him for three years through his process of change. REUTERS/Susana Vera SEARCH "VERA GABRIEL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: SPAIN-LGBT/ THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES

Petra van Dijk, 51, walks along the Amstel after changing her officially registered gender from male to female at the City Hall, in Amsterdam July 1, 2014. Dijk is among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Damian Jackson (C), 51, shows family members his new documents after changing his officially registered gender from female to male, in the City Hall in Amsterdam July 1, 2014. Jackson is among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Petra van Dijk, 51, signs documents as she changes her officially registered gender from male to female, in the City Hall in Amsterdam July 1, 2014. Dijk is among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Damian Jackson (L), 37, and Petra van Dijk (R), 51, enter the City Hall to change the gender section on their official documents, in Amsterdam July 1, 2014. Jackson changed his officially registered gender from female to male while Dijk changed hers from male to female. They are among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Damian Jackson (front L), 37, and Petra van Dijk (front R), enter the City Hall to change the gender section on their official documents, in Amsterdam July 1, 2014. Jackson changed his officially registered gender from female to male while Dijk changed hers from male to female. They are among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Petra van Dijk, 51, displays her new documents after changing her officially registered gender from male to female, in the City Hall in Amsterdam July 1, 2014. Dijk is among the first to obtain new documents on Tuesday, when a new law came into effect, legalising the registration of a transgender person's preferred gender in official state documents, including identity cards and passports. It eliminates the previous law, which required hormonal treatment, surgery or sterilization before any change in gender registration is allowed. REUTERS/Cris Toala Olivares (NETHERLANDS - Tags: SOCIETY LAW)

Hussein Rabei, 33, who underwent a sex change surgery, speaks to journalists in the Bahraini capital of Manama October 26, 2007. Formerly known as Zaineb, Rabei was raised as a girl after being born with genitalia that more closely resembled a vagina than a penis. Rabei returned recently from an operation in Thailand to correct his gender --a procedure for which he obtained consent from both Sunni and Shi'ite clerics, and is the first Bahraini to go public with news of such an operation. To match feature INTERSEX-ARAB/ REUTERS/Hamad I. Mohammed (BAHRAIN)

Hussein Rabei, 33, shows a photo of himself in traditional women's wear before he underwent a sex change surgery, in the Bahraini capital of Manama October 26, 2007. Formerly known as Zaineb, Rabei was raised as a girl after being born with genitalia that more closely resembled a vagina than a penis. Rabei returned recently from an operation in Thailand to correct his gender --a procedure for which he obtained consent from both Sunni and Shi'ite clerics, and is the first Bahraini to go public with news of such an operation. Picture taken October 26, 2007. To match feature INTERSEX-ARAB/ REUTERS/Hamad I. Mohammed (BAHRAIN)

Hussein Rabei, 33, shows a photo of himself in traditional women's wear sitting on a Saudi-registered car with his brother before he underwent a sex change surgery, in the Bahraini capital of Manama October 26, 2007. Formerly known as Zaineb, Rabei was raised as a girl after being born with genitalia that more closely resembled a vagina than a penis. Rabei returned recently from an operation in Thailand to correct his gender --a procedure for which he obtained consent from both Sunni and Shi'ite clerics, and is the first Bahraini to go public with news of such an operation. To match feature INTERSEX-ARAB/ REUTERS/Hamad I. Mohammed (BAHRAIN)

Topher Logan relaxes at home in his Brooklyn apartment, February 14, 2007. Logan, 28, refers to himself as a "queer transman", meaning he was born as female, but identifies as a male and has relationships with women, men and other transgender people. He injects himself with testosterone, known as "T", twice a week in order to create and sustain traditionally masculine gender traits such as facial hair and a deeper voice. Two years ago he underwent a bilateral mastectomy, known as top surgery, to modify his chest. Logan believes in gender fluidity, and binary gender as a social construct. REUTERS/Erin Siegal (UNITED STATES)

TO MATCH FEATURE STORY BC-HEALTH-SEX CHANGE - Brenda Reimer was an awkward child, who did not engage in girlish activities and was mercilessly teased by schoolmates for her gunslinger stride and lack of interest in boys. Doctors told her that her discomfort was due to a passing phase of "tomboyishness." What they didn't tell her was that she had in fact been born "Bruce" and had been subjected to gender reassignment surgery at 18 months, 10 months after doctors botched a circumcision and destroyed most of his penis. Instead of raising their child as a boy, Bruce's young parents took the advice of a famous American medical psychologist, John Money of Johns Hopkins Medical Center in Baltimore, who said that Bruce could be a happy "Brenda" with the proper treatment and hormones. He was later known as David Reimer.

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TO MATCH FEATURE STORY BC-HEALTH-SEX CHANGE - Brenda Reimer was an awkward child, who did not engage in girlish activities and was mercilessly teased by schoolmates for her gunslinger stride and lack of interest in boys. Doctors told her that her discomfort was due to a passing phase of "tomboyishness." What they didn't tell her was that she had in fact been born "Bruce" and had been subjected to gender reassignment surgery at 18 months, 10 months after doctors botched a circumcision and destroyed most of his penis. Instead of raising their child as a boy, Bruce's young parents took the advice of a famous American medical psychologist, John Money of Johns Hopkins Medical Center in Baltimore, who said that Bruce could be a happy "Brenda" with the proper treatment and hormones. He was later known as David Reimer.

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