Do I have a mental disorder,and if I do,which one?

Mood swings like this are really common in teenage years. If you are noticing that your lows are extremely low and your highs are extremely high, then you may have a problem. It sounds like bipolar disorder but it could also be normal teenage hormones. You can go to a doctor with a friend or alone and talk to him about it if you are concerned. He might be some help.