Congrats to you on our HS graduation...wow...college. I never made it and think it's awesome that against many odds you're going. You'll make a wonderful teacher and be an inspiration for the kids.
The college will have counsellors there for you, so don't feel you'll be without a therapist. They offer so many free sessions per semester or year. Take advantage of it. Most also offer alanon and other services in regard to drug and alcoholic addiction.
Hugs to you Shana