Conflicted

So someone that my best friend is friends with is throwing a surprise birthday party for my best friend. I really want to go but the problem is, I’m not really friends with anyone she’s inviting, I tried to become friends with them but we just don’t click and it’s very awkward every time we hang out so I end up just not really talking. I don’t want to spend the whole party doing that, especially since I can get really bad anxiety in social situations and being with people I don’t know well only makes things worse. I could always just hang out with my best friend the whole time once she gets there but I don’t want to just cling onto her while she’s trying to talk to her other friends. She probably wouldn’t even talk to me that much since everyone else would want to talk to her too obviously since it’s her birthday. I think I would just be annoying honestly and I don’t know why I keep getting this feeling that she wouldn’t care if I didn’t go. I’ve been in situations like this before with her and she probably wouldn’t even want to talk to me the whole time and I would care if my other friend were going but they’re not so I’m just stuck with a bunch of people that couldn’t give 2 shits about me so I just would I even go? But I’m sure she would want me to go and I’m just being stupid and I feel terrible not going, but I really don’t want to put myself in a situation like that if I know I’ll feel awkward and panicky the whole time. What should I do?