Being born in the wrong body, because if I was born in the correct one, I wouldn't have to deal with trying to be able to afford hormones/surgery, (I absolutely hate that I can't produce enough testosterone by myself and that I need assistance) I wouldn't have to deal with societal bs, I wouldn't have to deal with hearing "But you're such a pretty girl!" either. Coming to terms with being gay/queer is almost never easy, but it'd be so much easier than coming to terms with being trans. And most of all, I wouldn't have to deal with the horrible experience of female puberty which psychologically damaged me brutally. I haven't completely healed from the experience, and I doubt I ever will. What happened is something no one, especially a ten year old, should never have to go through.
Born in the wrong body all the way, hands down is what I hate the most.