no friends in class help

So I just started school and have really bad social anxiety. I have no good friends but I have a few people that I get along with. However, these people all have closer friends so they just hang out with them, which is fine for the most part. But, tomorrow we have to pick a partner for yearly lab groups, and all the people I would want to partner up with already have a partner, and basically everyone else has at least one friend they partnered up with... idk what to do, I feel so alone and scared!!