see this post is kind of misleading to me, your transgender, pretty much if anything you do blurs the gender lines, now what part on the name game you think you are is different, I think im transgender because society keeps saying I am, I know I am a transsexual woman because I believe I am and no other term feels correct to me....Now the way id translate your question is "What do you believe caused you to not fit the standard mode of identity?" (What follows is personal opinion)
I put it this way, quoting CBS for this "A colorado man goes into a hospital for a kidney stone and leaves a woman" It was determined she had female anatomy therefore intersex would be most acceptable term. So if it is viable for a deviation to be hidden inside her and go undetected she would most likely continued as a guy, so if it can be many different cells, why then cant a deviation be in one cell so small and so out of place science hasnt found it, that throws the whole identity out of whack, kind of how christians respond to "Have you seen god?" "Just because you dont see him doesnt mean he isnt there" So just because we havent found this deviation doesnt mean it doesnt exist. The deviation could be caused by dumb luck, enviromental, our genes, or aliens but I believe that this is why it happens.