You should talk to whichever parent you have the closest relationship with, the one who is easiest to speak to. Tell them that you think something might be wrong with you, that you're becoming depressed and you feel it is important that you see a doctor. You don't have to go into great detail; just make sure they facilitate an appointment with your primary care physician so you can talk to someone professional and possibly get medication to help you out of your depression. It can be a hard conversation, but you have to just dive in, and the sooner the better.

If you would rather not tell them then I would go to your school counselor and they could probably refer you to a clinic or get you on anti depressants. Be warned if you tell them you feel suicidal they will most likely make you go to rehab, but if you really do feel suicidal then that is the best thing to do. If you want to tell them because that would probably be the easiest way to get help then just sit them down 1 by 1 and tell them exactly what you are saying on here. I struggled with anxiety and depression and am just recently getting help for it and just got on medication today, but trust me it's not worth it to go years with it because it's going to make your life miserable.

depression isnt a real disease just get a bj and youll be happy