I saw on the forums that many young people struggle with this menace so I felt like writing a few lines on what I know about this subject.
Depression is being accustomed to negative thoughts. You can't be surrounded with happy people and be depressed. By watching mostly your parents and then all other people being frustrated, scared, unhappy, tired, angry and such, makes us feel the same way, and little by little we integrate these feelings into our behavior. Later on those feelings start affecting the body so we get physical symptoms.
I spent nearly 10 years in this state. I recovered when I decided I want to recover. The only cure I know is distraction. I had no medication, my parents never thought of it as an illness so I never saw a doctor. From my point of view today I never needed no medication. All I needed are the things that make me feel good.
From my mother's point of view it was always me who has problems, why couldn't I be normal like other children. I grew up in guilt and hating myself. I wonder if I could ever skip the depression phase. To be honest, the distance from my family helped me regain my self-respect when on college, but what is really important is to keep your mind off the problem as much as you can. To draw, play games, watch movies, read, write, do whatever just don't think about problems you have more than you have to. This is important because thinking becomes a habit and the longer you're depressed, the harder it can be to change. But will can change eventually. In the meantime do something for your self.
Even now when depressing youth is behind me I sometimes slip into the familiar negativity. But I get out of it because I don't want to stay there and waste my time. The only thing I regret in my life is wasting my precious time. I don't regret losing anything or anyone anymore, new things and people come easily when you make room for them. For me the way out is always the same: to do whatever makes me feel delightfully distracted. Reading, walks, art, games, people sometimes, whatever makes me feel good. (People can make feel better, but they can also make you feel worse, so choose carefully. Don't expect them to solve your problems, don't even tell them your problems. You need them to distract you, not to talk about the problems. ) I don't recommend music unless it's very positive and uplifting. Otherwise it will just hold you in your bad mood.
When you find one thing you enjoy in, soon enough you'll find another thing you enjoy in. It's the same with things that make you feel bad, if you find one thing, pretty soon you'll find another. Choose to find only things that make you feel good. If you find something that doesn't, ignore it and keep searching. And let yourself enjoy. Things are getting better. Everything eventually gets back in it's place and there is no need to spend your time in the bad mood.
This doesn't mean to ignore your own feelings. Acknowledge how you feel. Be sad, be angry, be afraid. But not your whole life. Emotions are the compass that tells you where to go, and where to not go. You need to be aware what made you feel bad so you can cope with it. Or avoid it. But if there is nothing to do about it right now, let it go and do something that would make you happy. That's all there is to do.