Haha me too..
Along with waking up in the night thinking I wish someone would shut that crying baby up, only to realise it was mine and I was the one who needed to sort it out!!
DS screamed for his first couple of hours of life. I still remember so clearly this moment of "someone needs to calm that poor baby" and the smack in the face of reality that that someone should be me. Never have I felt more unprepared for what life had in store than in that moment.
OP I remember rather optimistically thinking I'd done pilates and pregnancy/birthing exercise classes. The ob will probably just have to stand on the other side of the room with a baseball catcher's mit. Apparently that's not how birth works - who knew!?