Please tell me if i'm causing a problem

Your boyfriend like most guys has insecurities about himself and trust issues more in regards to your guy friends than you but either way he has to just let things be and realize that by making this an issue it;s gonna push you away. It's hard because guys know how other guys are with girls and that's probably what has him so torn right now. He's gonna have to just trust you and know that he doesn't have to worry.

Not doing anything wrong at all- as long as you are truly just friends with the other guys. Boyfriend needs to accept that you have male friends. Be careful if he doesn't- that type of attitude is a clear sign of a man who later in the relationship may become very controlling. DEFINITELY do not lose your friends over him. When you break up who will you go to?

No. He is insecure. He has the problem. Friends are Friends no matter what gender.

No I don't think you're doing anything wrong at all, dear -- trust me, I'm the same way. I have numerous guy friends that I've know for 8 years + that I still hang out with or talk to. But I also always invite my man to come with me, just to ease his fears a bit. And I want him to be friends with my boys as well ya' know? He may just be a little insecure about the fact that deep down he knows who you're going to turn to, if the two of you have a problem and it's possible that you beau feels he won't be able to make face if something like that was to happen. Hang in there. I think the two of you should definitely talk it out if you can, and do invite him to go with you whenever you hangout with your peeps (if you haven't already done so before), so he can be assured by seeing it for himself that there isn't going to be any boot knocking going on behind his back.
Chin up, girl!