<human>: Can you summarize the given text in a few sentences?

I have always been uncomfortable hanging around my BF's friends for little to no reason. I get extremely anxious about hanging out with them and often cancel; in total, I've probably hung around them 4-6 times during the nearly 2 year relationship.

Background: In the beginning, BF made it seem like he was not interested in me getting to know his friends (comments like "Saturday is guys night" & "It won't suck that much for you to come"). Other comments he said made it seem like his friends did not like me ("Clint was mad after you bailed on me" & "Fred said something really rude about you last night so I'm mad at him").

Present: Now BF wants me to come hang out with his friends. I think this is because we are more serious and his friends bring their GFs. While I think BF sincerely wants me to hang out, I just can't bring myself to do it without a great deal of stress. I think about everything that was said in the past and can't shake the idea that I am not welcomed, even though nothing of the sort has ever been said to me. 

I've talked with my BF and we both think that I should try to hang out more. However, I have not made much progress, only hanging out with them 2 times since the last talk and the stress I feel about the whole thing is getting worse. I am looking for a way to minimize my anxiety over hanging out with his friends.
<bot>: Anxiety over hanging out with his friends because I feel unwelcomed even though nothing rude or unwelcoming has been said or done to me.