Besides, I've never felt like I was born into the wrong gender, just an overcomplicated body. It is insanely hard to come to terms - for two years I thought I was gay despite not being attracted to men and spent a year periodically crossdressing before I realized it didn't do a thing for my psyche.

However, I think that there's another aspect to it as well in that we've traditionally identified gender on a binary basis and many men's brains have been trained to think that way.