ruonitb is right on.
Lol @ all the people saying "I have a few of the symptoms and the more I read about it, the more I think I have it!".
I have displayed some of the symptoms of Asperger's throughout my lifetime, but let's not get carried away here.
No, chances are you probably just have social anxiety disorder like me and are also a naturally introverted (can easily be entertained on your own without needing others around)
Until fairly recently (start of last year), I had trouble looking most people in the eye when they spoke. I'd fidget a lot and look really nervous, giving the impression I'm not 'normal' to people. List goes on.
I've managed to improve on most of the things that social anxiety has held me back from doing and I've stopped being so awkward.
I may be an introvert at heart. I love spending heaps of time reading, learning about stuff and your average bimbo would probably consider me fairly intellectual, but I'm not really all that shy anymore and actually quite love social interaction too.
If anything I'm probably half introvert/half extrovert than a true introvert.
Anyway, I digress.
If any of you guys feel lacking in the social skills department/feel scared of many social situations, go get a diagnosis and and see a psychologist. There's no shame in it and it can only help improve your quality of life.