Hi, I have the same problem.
Some people seem to think its good for us to be forced into these situations, but i have rarely had a good experience, I think the only time I had a reasonable experience was when I was at a disco for my sisters birthday, and my sister told her partner to keep anyone away from me who was likely to make me nervous.
My usual experience is that I panic, I shake when holding a glass, which makes me scared to pick up the glass as people may notice it, I become very quiet as I am scared of saying something stupid, people then pick up on that I am quiet, and attention gets drawn to me which makes it even worse. On one occasion my sister took me to a pub, and people started picking on me, almost the entire pub, my sister rushed me out of there and said she will never ask me to do that again.
For me I think the problem is because I used to get bullied at school, and I am basically scared of been around people all my life because of that.
So at least its good to find other people on here who have the same problems.