I also suffer from the same thing... my advice would be to stand up and introduce her to everyone at the same time... like say everybody this is my girlfriend and and then tell your girlfriend this is everybody... lol!! It might lighten the mood a little bit.
Maybe you should tell your girlfriend about your problem and she will understand it better but if your like me then your ashamed of it!! :(
You can do this!!!
So have you managed to overcome this at all? I hate feeling like this, just don't feel myself when it comes to social events when really I should be embracing them!
I also suffer from Social anxiety and currently on Effexor XR 75mg for this condition.