I've been fairly socially isolated my whole life - my younger sister was the tomboy, always playing with toy cars and climbing trees, but since I didn't really play at all, had no interest in what clothes I was put in, had no real contact with either boys or girls in primary school after being more or less ostracised with alleged selective mutism until I was about eight... gender was never a real issue for me. Having said that, I naturally placed myself in the male categories in teams, even tried football once - God that was a disaster - and, I think, just generally assumed everybody ignored burgeoning evidence of their feminity, as it were. It was only at about age fourteen when I suddenly realised I had to start socialising because being bullied was boring, and consequently spent two years or so posing as a female that I thought something was going on. Being assessed for Asperger's, I thought, would be a way out, but the psychiatrist wouldn't diagnose me beause I wasn't male and she hadn't seen Asperger's in a girl before. Additionally, ignorant specimen that I am, I sort of assumed that changing from female to male 'wasn't allowed', as well as when watching a documentary about breast augmentation at about age ten, I assumed that reduction also wasn't allowed, somehow, and thence dismissed the matter.
Excitingly, finding I had to confront the fact that appearing female was putting on an act coincided with the sort of teenage angsty years which lead to a lot of unpleasantness for all involved, so I believe, and it was about a year ago precisely that I decided 'no, I'm fed up with pretending and being confused'. Personally, the issue of gender was always tied up with that of sexuality, and I still haven't been able to separate the two - am I physically inclined towards males or do I just want to emulate them?, for instance. But I came out, as it were, to a friend of mine at about the same time as I started binding and actively seeking out male clothes. Mother, for reasons unknown, confiscated my binder and the penis I had and forbade me from wearing male clothes or cutting my hair short, and that's still going on, but during sixth form there's too much going on what with university applications and A levels to bother with equivocation, which is really what's spurred my decision to just get the hell on with it - will be going to the doctors in the next few weeks.
Anyway, apologies for cathartic drivel: my story is in fact not too different from a lot of others I daresay.