We are who we are. The entire time I presented as male I thought I was hetro. Garbage that. Social conditioning as near as I can tell. Now as near as I can tell I am and have been bi and now just no longer suppressed...
I think (emphasis on that) that a lot of where 'it' (the new and contradictory feelings/thoughts/etc.) all comes from is it is who we are, deep down. There is a lot of being honest involved in transition, and a lot of throwing away what we thought, and what we were taught to think.
Transition is an interesting process to be sure.