Autism; what's it like?

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I've just had one of those who am I? trains of thought, and found this excellent article online. The parts that immediately jump out at me are the sections on noise, communication, touch and socialisation.
Noise and sound have a serious effect on me, and can quickly drive me to the point of exploding.
I am highly articulate, except when it comes to expressing how I feel. I find this easier in writing, hence my blog.
I hate being touched by people I don't know well, and also hate too close proximity of such people.
I tend to be on my own most of the time. I have learned to be more comfortable in a social setting, but at a distance, and not too often.
I have some repetitive behaviours that I don't know I'm doing until I'm doing them. Firstly I play the piano on my knees. Secondly my right knee goes up and down when I'm seated. These always happen when I'm deep in thought.
There are all sorts of things I recognise about my life. I only wish I'd known sooner.