He's about to be legal...

So my boyfriend is about to turn the legal age of 18 in a few months. I won't be 18 until mid next year. I'm nervous if he goes out clubbing and stuff because he doesn't act good when he's drunk. His friends encourage each other to go to girls. Even when they're taken. I'm scared he might do something to hurt me and us. How do I stop thinking this way?

He has been unfaithful before and kissed another girl. He hasn't done anything else bad other then that time.

My anxiety about it has gotten to the point where I'm considering a fake ID. And I know it's not a good idea so I won't but that's how nervous I am. I won't stop him from going out and I'll trust him but I'm scared he might do something.

Thkvhts on how to control this feeling ?