How do you get over anxiety from hanging out with your boyfriends friends??

I know it sounds crazy but I literally get anxiety when we go to my boyfriends friends house. It’s always a lot of people there but I’m not into the type of things they are into. I don’t vibe with them and usually I’m in the corner sitting by myself with the dogs. Of course I try to put myself out there and talk to people but I struggle to connect with them. I’m 27 and all of his friends are in their 30s and have been friends since highschool and are super close. I feel like an outsider and I can’t wait until we leave. I’ve been trying to explain to my boyfriend how I feel but I don’t think he fully understands. I feel so conflicted about this because I don’t want to go anymore but i know he wants me to go with him.