Boyfriend’s female friends

I’m not sure what to do about my boyfriend’s female friends. We have been dating for awhile now and I have had a hard time connecting to his female friends. We don’t really have anything in common and live different lifestyles. It is easy for me to talk to his guy friends. I don’t know why it is so hard for me with the girls. I have social anxiety and he doesn’t understand that. But I also don’t want to use that as an excuse. All of his female friends are close with each other so it is hard for me to fit in. We got into a fight about it cause he feels like I am not trying. I don’t know what to do or how to become friends with his female friends. If anyone has any advice, that would be great!