Eh, identity and your sense of self is what you are. For a parallel - nationality, I was born in England to Scottish parents, if Scotland had gone independent I'd almost certainly by entitled to dual nationality: but in terms of who I am - I'm a Scot; and except when I'm bantering with English friends about how **** youse are at football, no-one bats an eyelid - my national identity is who I am, that's not controversial. Why should it be with gender, which could be considered as your neurological sex?