I get this feeling too, it takes so much out of me, all the anxiety and panic and not knowing what to say or how to act, then when it's over I just feel so depressed and worthless. It's like all the energy that goes into stressing about the situation just drains me. I evaluate all the things that happened and all the things that were said and worry about what I should have changed about myself. Nothing I do is ever good enough, I just can't function socially.