Hey,
I know how you feel, and it sucks.
From your brief description I think you may have anxiety (with a social bent) at its best.
Although I am a work in progress, my advice is to:
1) Really decide what you want from every social interaction. (what are you chasing?)
2) Improve your current thoughts for better feelings... ie Cognative Behaviour Therapy.....
I recommend checking out
MoodGYM: Welcome its recently helped me get through a tough time.
If you need to chat with a like minded soul I'd be glad to offer some advice or understanding. email me voltage_123 at yahoo.com.
My brother and I are both susceptible to anxiety but its great to chat with him about the reality of a (perceived) screw up, cause I don't need to explain why I think it sucks, he just gets it.... then he calls me a loopy f*cker.
It really is funny in a world of constant fear, and it helps a lots.
Seriously, send me a mail, and we'll chat.... if not my heart is with you and best of luck.
John