I think I would first go back to sleep, I'd tell my father that I am having a crisis of sexual identity and i wanna stay home. Then later i'd wake up and pee. Then I would come downstairs and eat something, and wait for any sign of unusual reaction from my father. If there is none, I'd ask him if I was always female. I'd call a few friends to see if they think i'm female. If it is eventually established that i've always been female, but that is the only difference, i'd come back up to my room, and check to see if i had any bras. If I had any, i'd put one on, and then sit down here, start drinking a beer, and start attention whoring in all my usual places. Maybe go do an instance, razorfen kraul maybe.
I'd check to see if i had a nice singing voice, and whether my pussy lips are the tucked in kind or the open kind, and if i haden't already I would consider having laser surgery to remove all the hair below my waist even more seriously than I do now.
After enough attention whoring and wasting time, i'd go to sleep.