Social Suicide Anyone?

So I am severely anti-social but I still end up in scenarios in which I have to talk to people I don't know. Because I am so terrified of talking to people, when I do have to speak I can come across as strained and all that jazz. Pretty much there are instances where my tone doesn't match my intent. I had a run-in with this problem today when I was talking to a new college professor of mine and apparently, I sounded hella rude... So I screwed up :/
It explains why he sounded so rude when talking to me today. Now I feel like I need to apologize and shiz but apologizing=more socializing=DEATH. I'll apologize regardless though. I hate when this happens!

Anyway, I was just wondering if anyone else has any stories about social anxiety or just you socially screwing yourself over.