i am not really sure on your specific question, but acting overly girly and feeling like a little girl I would say are totally normal from what I hear most new trans women go a bit overboard at first, decades of being forced to hide every bit of that part of yourself, when finally let loose, it can be like holding your breath for a long time, when you finally breath again its in gasps and shuddering desperate gulps of air. I personally am trying hard to limit myself, not go into that barbie stage where everything is pink and ultra fem, I am almost sure that isen't who I am so I am trying to be a bit more casual. (it hasen't worked all that much, mostly I just worry I am acting too overly fem or not fem enough then I start to freak out.)
so I say dont worry about how your acting now, you missed a childhood as your true self, your owed at least a few days dressing up as a princess fairy and skipping through a open field. :-)
Serena