i am feeling quite depressed at the moment also. this is because the worst things that can possibly happen to a teenager have all happened to me. i lost my boyfriend, then my idol died, then i couldn't go to a once in a lifetime show, concerto i wanted to go to, then some of family died, then i had my new digital camera stolen that i had saved up for for monthes, then all my friends left my school and i'm the only one left, then my special horse was taken from my local stables. so i am feeling pretty depressed too. i know. it doesn't seem like that much bad luck could possibly happen to one person, right? well it did. to me. so i get where you're coming from. my advise to you would be to have a good chat with someone you know and trust to listen, and tell them as much as you like about why you feel depressed. it helps to tell people sometimes.
or you could go to a national park where there are quiet isolated places with beautiful scenery where you can just sit and think. you could try listening to música to help you. it always helps me. what i did when i didn't feel so good was i went out and chose a little kitten, 'Cider', for company. i have a lot of experience with cats, so it was a good option for me. he sits on my lap a lot, and it gave me some responsibility, so i'd have to care for Cider instead of sitting and worrying about my problems. it took my mind off things.
Depression is not a great sign. Talk to someone, your friends, parents, etc. They can help you. Also, hang out with friends, go the pool, go to the movies, anywhere! Don't go down with depression alone. :D
If you´re feeling depressed during a longer period and don´t find a reason, you should consult a doctor. There are some physical reasons, one should check out first, e.g. the level of estrogenes or the functions of the thyroid. If that´s all o.k., you should look upon your life, perhaps with the help of an psychiatrist: Do I care for what I need? Am I happy with my relationships? Am I perhaps bored por what I am doing (or the opposite)? Do I long for something new? I hope, you´ll be better soon!
It's funny you're asking about this because I literally JUST took a health class that talked about depression.
Most cases of depression occur when you can't even understand or pinpoint why you're feeling so bad. The only real cure for depression is to see a doctor (who will either recommend therapy or give you antidepressants). And don't think "oh I don't want to see a doctor because people will think I'm weird" or "I'm afraid to tell my parents" or any of those other excuses. If you're depressed you need to get help. Even if it's just a little depressed doctors can help a lot. So that's the only real way to feel better. Sorry if that's not the answer you're looking for, but it's the truth.