I was confused. I'm still confused. I expected to grow up bisexual, then ended up not attracted to females sexually (well, I'm not really particularly *sexually* attracted to anyone, but much more willing to have sex with men than with women when necessary to get the romance needs met - add a decent sized scoop of asexuality in there for good measure and even more confusion), but the whole "plain vanilla straight woman" thing just didn't fit at all. Nobody believes I am anyways, no matter how much I tell them I am, and it's not because I go out of my way to look butchy!
I also wondered for a while if I was FtM, though being attracted to men, transitioning would probably create more problems than it solved. So for me, I feel kind of adrift in the middle of everything. I didn't even know that being outside the binary, staying there and being happy there, was actually an option until the last couple years, rather than just one gender, whether it matched what the doctor thought you were born as or not. Don't know if anything would have been different had I learned anything earlier, though...being "different" in high school was not a good thing back then, so actually knowing what was going on may have made things even worse socially, for me, especially in a small town!