Hmm, I am in college majoring in Psychology, so I know quite a bit about these "disorders". Whatever you are experiencing is seriously not your fault, it all has to do with chemicals in the brain and it's something you can't help without professional help and being open to this help.
With that said, when I was 14, I was going through a lot of changes in my life which led me to depression and suicidal tendencies. At about 15 I attempted and failed, and at this point was taken to a psychologist. Although the psychologist didn't exactly help me, the things I learned did. At about 15-16 I was still suffering from extreme depression mostly due to my social life due to events prior, but I joined the basketball team and it quickly changed.
Today, I am 18 and I suffer from Bi-polar disorder, this of which I have no intentions of doing anything about. It runs in my family, so the likeliness of it being "cured" is slightly bad due to my biological line to it. Doesn't really affect me that much, or rather as much as it used to. I have never taken med's and don't plan on it. All med's do it release chemicals in the brain and I don't trust people enough to mess with my crown.
BTW, a lot of people diagnosed with ADHD and the likes, do not actually have ADHD and are taking meds for something they don't have, which in turn can do more damage than good. Especially in kids when it is normal to be restless, but doctors are so quick to label people they don't actually take the time to find out if it is the right diagnosis. Just a heads up.