I know how some meds can give that pro-social push (dextroamphetamine, for example), but remember that a lot of the brain completely shuts down when in the grips of anxiety, and if you overcome that, you may find your ability to have interesting, fluid conversation is pretty normal.
I know a lot of SA people convince themselves they are boring and/or incapable of certain social activities, but this isn't true for most. Yes the anxiety might make it seem that way, but there are usually some people even the worst SAers feel comfortable around, and they could reach that level with everyone. Hey maybe even a beta-blocker would help test your natural social capacity.