You need to tell someone/ go to a doctor. Many people suffer from it many dont say anything and it affects the quality of life as it has with you. Theres nothing wrong with being on medicine for it many people I know are.

Also you can try St. Johns wart supplement its said to help mild depression. Make sure to research anything you take though. St Johns wart does not have any side effects that I know of and can be gotten at any store without a prescription but check that as teenagers are a bit different when it comes to anti depression medication. I take it three times a day and it helps mellow me out a bit ( I am a very high stress high speed person). Costs about 20 bucks a bottle (big bottle)