Perhaps this will ease some of your confusion: I'm not a girl and have never believed, nor claimed, myself to be one. I only long, desire, dream to be one.
A previous thread of mine inquired whether there is a difference between those who believe they're women inside and those who deeply desire it. Some argued there is a big difference (I believe you fell into that category) whereas others augured there is no difference.
I'm inclined to agree that there is a difference but perhaps it's not really important as the paths and destination in transition are, mostly, the same. On the other hand I feel that our intentions for pursuing transition hold greater importance and should be scrutinized. Perhaps a large part of regret comes from those who intentions were not adequately met (ie: fetishist perhaps).
So, no, currently I am not a girl nor do I go out dressed as one. I've done so in the past and it made me incredibly happy, but not again, not yet until I'm ready to tell the world this is who and what I truly am.
Having said all this, maybe I really am a girl inside and only believe I'm not as a result of being raised 32 years as a boy and taught that exploring femininity is wrong.