Eva Robins was born male in 1958, but developed naturally feminine features and breasts during puberty, despite being a normal boy growing up, her body failed to masculine like the other boys of her age.
From the age of about thirteen she says she felt she wanted to be a female. When she was sixteen, she started oestrogen treatments. By the age of twenty-one she was living completely as a woman.
Read all about it over at Lost in Transgender.