People with social anxiety disorder (AvPDers included) experience stress/worry/fear in anticipation of social events and tend to over-analyze them afterward (in a self-critical way) just as you are describing.

Just to throw it out there, if you are experiencing these obsessive, ruminating thoughts about other things besides just social situations then OCD might be something to consider. I have a friend diagnosed with OCD who plays things over and over in their head like that, but in the case of OCD it would not be exclusive to social interactions so that's kind of a leap based on what you posted...

Welcome to the forum!