Elisabeth Badinter, a french sociologist wrote a book 15 years ago called "XY, de l'identité masculine" (tr : XY, concerning male identiy)
She demonstrated that "male identity" does not exists.
When a baby is born, he (or she) knows immediatly what is to be a woman because the first human contact comes from the mother. The girl which stayed close to her mother, doesn't generally question her gender identity.
The boy has to differenciate his identiy from the mother by expressing signs of virility (competition, violence, etc). Boy's final choice of gender, generally appears after the puberty but more after teenagehood.
Sorry for the short sum up (the book worth reading...) but in a way being male is just not being female.
Pushpa