Yeah, I think maybe you have more General Anxiety Disorder than Social Anxiety....?
See, because people with SA get depressed more from having no friends/relationship/job or not being able to talk to people, than they do about being anxious - they sorta just "accept" it... though not like it. They're just basically more concerned with being accepted or liked than about not being anxious.
It's all a bunch of fine lines that determine 'this or that' - I suppose we all have a "little bit of this and a little bit of that"... when it really becomes a problem is when "this or that" affects your life in a negative way
See, recently I went to this bonfire meetup for people with Social Anxiety/Shyness... and I noticed that a few people there that claimed to have "Social Anxiety" were getting married, had jobs where they interviewed people, or were pretty talkative and secure with themselves (I suppose the "real" S/A'ers were stuck at home

though there were a few that indeed were very quiet and acted strange, myself included).
Now, how can that be possible to have SA and be getting married or have a job interviewing people? (it's like claiming to be handicap (as in missing a leg or something) and running a marathon).
I think these people had more an issue with insecurities and not really what is classified as 'Social Anxiety Disorder' - but then again, maybe it's just a much milder form?
From my perspective (having a very severe case of SA and having come a long way), I just don't think that people like that classify as having 'SA" anymore - they're more like "shy" or "introverts" - which all they really need are lessons in self-esteem and/or a confidence-boost. Of course they may have another disorder along with this "shyness" or "introvertedness" like GAD or depression that makes their mental status worse.
So, to me, if you have no real friends, no romantic relationships, difficulty at school/work and have difficulty talking to or being yourself with people(or varying degrees of all these problems) then you have SA... if are missing even one of these (and others), then you're probably just shy or introverted (which by the way, *congratulations*, because you are more lucky than you think =)).