Being thoughtful and tactful is a good thing, but I think if you focus too much on what may or may not come out of any given social situation, you are putting far too much weight on simply "being", if that makes any sense.
Thinking about the lasting consequences of anything you say to the point of paralysis or developing a fear is not good. I think a part of social anxiety is wanting to have too much control over things. You can control what people think of you only to a certain extent, hell you can only control your future to a certain extent, chance plays a huge part in that.

But I dunno..I'm only speaking from my personal experience with it, which has been pretty severe.