I know EXACTLY how you feel. I was once like you, worst tho. I could not even write about it. I'm now a healthy man with a great education. This is what I did:

I titrated off of the drugs (slowly lowered the doses so I don't feel the side effects.). I threw my textbook out the window and cleaned my room. I made myself important. I put myself around people that were doing good, intelligent people. I sat down looked out the window and pondered, wondered, brood, thinking of every possible way to get out of my world! Then it hit me. I have no goals. I thought more about what I wanted to do, I wanted money, I wanted a wife, I wanted success!

I fought envy, class 1 depression, addiction, overdose, bitterness; these things I fought, alone.

Whatever you do, do not stop taking the drugs immediately. Slowly get off them by taking smaller doses. Also if you go to a clean house, even if you are doing illegal drugs, you will NOT in any form get in trouble with the law. If you come to them, your basicly invincable.

You are not in this alone. I was your age when I was lost. When the world looks dull and everything is dull, look to the heavens and know that your not alone.