I'm rethinking my advice about not worrying your parents. Sounds like they "know" even if you haven't told them. That does change things and I think you should tell them that the struggle has continued but this time you're the one who wants to change.
Aside from that, I can relate. The first time I was serious about doing something to quit I did an outpatient thing with my health provider. The groups were conceptually the same as AA but not AA - just a group share type thing. I remember once this guy sitting next to me shared about the murder he committed. Pollyanna here tried to keep my face straight, not sure how well I did. Since then I've come to realize that everyone has a story and there are some situations where you feel you can relate and others not so much. BTW, I stayed sober for over 6 years but then gently eased right back in. I regret it but you can't rewrite history.
Stay strong, you can do this.
What's the book?