nothing is wrong with you. it's perfectly normal (whatever that may be).
think about it though. for so long your life has been filled with, like you said, anger, drama, overwhelming emotions.. and now, those things aren't there to fill your life/time. it's when that realization hits you that hey.. what do I do with this void? is THIS what "normal" is? wth? it's almost as if you don't know what to do with yourself.
thinking you're afraid to be happy? probably. I sure was. it's that whole "if I'm happy, he'll think I'm OVER IT, or he doesn't have to keep up the way he's behaving now, or it wasn't a big deal or __________ *fill in the blank with your own fear*"
it's a weird feeling for sure.
the good thing is that it's not the same "A normal" you were living before. the even better news is that you get to make this "new normal" your own .