I know it's hard, but try and make a special effort to 'join in' and get to know people. When we feel a bit scared of a certain situation, we can start to feel a little paranoid and see things that just aren't there. Not that I'm saying you're making it up! But if your boyfriend can see that you're doing all you can to get-on with his friends, should they not respond positively, he's not going to lay the blame at your door, is he? It can be hard standing on the outside - but it's much warmer inside!