I was waiting for this question to pop up.
Well, ... No, I wasn't always a girl here. At least not as I signed up. But I started seeing a psychologist in the beginning of last year to help me find out what I want be doing professionally (I still have no clue), and in the process I ended up digging some stuff up, including the fact that I'm transsexual. I realized that I never really identified as a male, but wasn't quite sure why, and since that realization I've been coming to terms with myself and becoming more and more comfortable to express who I really feel like being. Enough to change my gender here and to start opening myself up to other people.
I did change it quite a while ago, though (months, I'd say). Thought no one was going to notice.