Being introverted or extroverted doesn't have anything to do with autism or how you handle social situations, IMO.
I am introverted (defined as: drawing energy from being alone, having energy drained by being with people), but I am pretty good in social situations. I have a former co worker who was extremely awkward in social situations, but is quite extroverted and outgoing.
In general, I find that all these mental disabilities from ADHD to autism are problematic when they are defined by a set of 'traits' to layperson. It leads to 'diagnosis' of people without understanding the true disorder. It is like when people over-organize and say 'oh, my OCDness got ahold of me' - but they are very far from having OCD, they have just heard one trait.
Leave diagnosis to th professionals (who has thei own issues and debates as this thread originally shows).