Cheating?

So I have been with my boyfriend for almost 2 years now. He says that he has NEVER cheated in a relationship in his whole life, he just couldn't do it. And I believe him and I really do trust him. But lately when he goes out with his friends (for about the last 2 weeks), I can't go because I am not 21 yet. I feel this sinking feeling in my stomach and I feel horrible. It feels like what happened the times before when I had been cheating on. I don't know what to do. I'm not sure if it is just my insecurities getting the best of me or what. What do you guys think?
Cheating?
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