I think when I was 8 years old I noticed I was a lot different than other kids. I was always shy and more intelligent than most of the kids around me were. That said, I always assumed (and so did everyone around me) that I was just the shy and quiet type. Deep down, I knew my problems were a lot worse than that, but I could never articulate how. Nor did I try, because ... well, everyone has problems.
And it's true – everyone does. In my case, though, I became less functional over time and eventually fell into depression. While I was in hospital, my psychiatrist suggested that I might have Aspergers. I wasn't thrilled about the prospect of having an Autism Spectrum Disorder, but after reading about it and talking to people with AS on forums (such as this one
), I realised that it made sense – and, finally, so did I.
I have recently been diagnosed with AS, and I'll admit to feeling relieved. It's good to finally fit in somewhere. Still getting used to it, really. 
_________________
It is easy to go down into Hell;
Night and day, the gates of dark Death stand wide;
But to climb back again, to retrace one's steps to the upper air –
There's the rub, the task.
– Virgil, The Aeneid (Book VI)