psycologic disorders like other health problems are diferent in diferent people.
I had tge sane doubt and posted a while ago, imho i think that you have SA because you described.
But you'll have to be sincere to your self, sometimes when i'm in my "confort zone" i become not so sure about my SA, but everytime when it comes to socialize i see it happening.
Analise a little back and ask yourself, are you living your life the way you want? are you missing something because of the fear of being judged, talking to people?
also Take a look on the
Diagnostic page