Why do I always seem to be in some type of pain?

You may be suffering from Fibromyalgia and depression. You definitely need to be seen by a doctor as there are different ways to treat teens as certain antidepressants can be harmful to you. I obviously am not a doctor but hate to hear about someone in as much pain as you are in, mentally and physically. Like I said, you seem to be suffering from depression, for which there is help and Fibromyalgia which would explain all your pain in other areas. This can't be taken lightly so make sure you see a doctor and get the help that you need. Sorry for you misery, and hope this advice helps.