i have trouble seeing what, what you described has to do with manic depression..
Obviously, you are struggling. Whether it is "just" the issues of being a teenager or an actual depression only a doctor can tell you.
If you are worried, talking to your parents may be a good idea but it is up to you, in the end.
getting someone to talk to on a regular basis, like a school counsellor or similar, could be a good idea too. It may help you get through this difficult time.
I hope you feel better soon.
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