Doubt comes in to play at many times. I know, when I was younger, I wouldn't give it some thought, when the thoughts first came up sporadically that I thought I was a girl, and that I had thought that maybe I was and my parents were hiding the fact that I could have been born a girl, that they didn't want one because for the life of me my life before age 6 is non existent, other than a small photo here and there. Like i only remember I wasn't boy enough, but I wasn't much too girly in my young years, other than never wanting to touch dirt, and get dirty at all.
Like I know now that I was meant to be a girl, and my thought patterns and how I do things, and how my brother and well my cousins and everyone in my extended family, I kinda take on patterns much like the girls in the family rather than the boys, except for going through with the military stuff.
Go with what's in your heart, and don't take a second look. If it is meant to be, then your choice goes farther to making yourself happy with you.
Kate ♥