That for me is a hard question to answer. In the begin maybe it was the pretty clothes and makeup. As a man I was always very uncomfortable and very ashamed of myself in everyday life. As a child I always wanted to be a girl and do the things other girls did. Most woman are more honest with each other. That is something I don't see in men.
This question I will think on and see what else I come up with.
I also never thought I could be a woman because of my height and shape. But as for now I just feel so much more natural as a woman. I know I am not pretty and won't make guys look twice at me but I am happy now.
Good luck with you quest. I am sure you will get some wonderful answers.