It doesn't make a difference to me who is there, I'm going to get scared either way. To put it simply, it's easier with alcohol, and lots of it.
I went to a party about six months ago and it was a birthday party of a fellow I went to school with. I went because my brother asked if I wanted to go. When I got there, there was a lot of people that I knew from high school and a lot of strangers. It was a nightmare. I hung around with my brother and his friends some. However, I kept thinking I was embarrassing my brother by hanging around him all the time, even though we are almost the same age. So, I would try to not hang around him, but I ended up just standing against a wall staring or sitting in a chair staring. I could hear people saying things like, "Is he mad?" or "What's wrong with him?". My brother kept asking why I was just standing there like a statue. I guess it was easier because the people from high school were friendly and since I had some cannabis to share, it was easier to socialize, but I was still SUPER shy and nervous.
It's kind of weird because I want to go to parties and have a good time with people, but my mind just messes it up for me.