Well, it's hard to say. The thing I notice is you tend to have this happen in the summer. Do you do binge drinking during school? Do your grades suffer? You mention a lot of anxiety.
Bipolar is like... unpredictable in my experience. Drugs and binge drinking can happen because of it, that's true. But, it's not on a schedule. It can be triggered by things. I know I have cycle shifts around January, April/May and then around August/September every year, which I don't know why they shift at those times.
But it does seem you have triggering things like friends that drink too much. When drunk you can't really say things you are doing are due to illness. More due to drinking.
But it sounds like you at least have some pretty sever anxiety. I agree you should see a psychiatrist. If you can't, then at least try a psychologist or therapist. That's really the only way you'll know. Your school may have some services for those things.
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