While we can sometimes be a bit domineering and try too hard when we think others need help one of the best medicines is to help others. I've found sometimes putting aside my comforts and needs and helping people in less fortunate circumstances makes the sense of depression irrelevant for a time and builds a sense of community in that environment.
Keep looking out for people

Most teens these days are bound to go through some kind of depression. And we seem to live in a society that would rather medicate things with a pill shaped band-aid than actually try to look at the issues at hand and do something about it.
I'm sorry to hear you had to battle this for so long. But like you say you've seen some simple things that help keep your depression under control. Love, community, a healthy diet, exercise, and MOST IMPORTANTLY sleep, are the keys to fighting depression. Many people still may need medical assistance but I wish we would push people towards good health and lifestyles.
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By the way I am going to be 80 years old in September and still feel like helping everyone with their problems but cannot help myself.
- on the contrary you do indicate you have helped yourself. Perhaps not as much as you would've liked and not as soon in life as you would've liked... and that is reason enough to be sad and to mourn. But you seem to have found the keys (that's better than some ever do) of accepting yourself, perhaps loving yourself, treating yourself with respect (includes having the self respect to take care of yourself which tends to lead towards self discipline), and then expressing yourself. Expressing yourself can be a very difficult step of healing. A very vulnerable one that touches very sensitive areas of ourselves. It is not for the faint of heart but we all must cross this some day when we can.
Take care and best wishes.