You need to get help. Your parents obviously don't understand the extent of the problem.
If you're in school, you need to go to a councelor and get help immediately. Don't worry about them judging you. THey're there to help.
You could also go to a free clinic or something, and seek help. If still you are having problems, do a search online to find help at a place near you. Might also help to join a support group- be it online or actual meetings(like AA holds).
Don't play around with this. Seek help. It's crucial.
Best of luck to you