All that and you are just 17
Seems like you are derpressed because you didnt have much of a childhood.
Do you go to counseling of any type? If not I would hope that you would want someone to talk to that could help you figure out where you need to be for your own mental health. Consider it if you havent already started.
This is a good place to come and let it all out and we all would like to offer some advise, but at your age and with the family situation, serious counseling might be of great help to you. Sounds like you would rather have a normal drug free life than what you have been dealt.
In Love and Faith