Hi,
I think that you know that what you are doing is very self destructive. You would not be posting on this forum if you didn't know that.
Doing cocaine is bad for anyone. It is even worse with your diabetes. Uncontrolled diabetes kills. Cocaine also kills! That is obviously double trouble!
Are you on insulin or just tablet medication. If you are on insulin you are flirting with death every time you take cocaine. If you are on tablet medication, you are still doing yourself no favours.
I recommend that you get out with this crowd that you are with, if it is possible. I also recommend strongly that you talk with your doctor, a minister, or any community programmes and see if you can get into rehab.
In the meantime, I think you need to reveiw everything you know about diabetes and do everything you can to get it under control.
You are too young to be killing yourself this way. Sorry to be so blunt. Best wishes.
http://www.youtube.com/watch?v=nl5gBJGnaXs