Welcome Lifeiscomplex. That is so great that you are figuring this out at 19. I would have had a completely different life if I had done the same. I'm happy with life in general, but I think drinking played a part in many bad decisions and you pay for that in so many ways you could never imagine at 19.
Look into AVRT-the techniques helped me deal with peer pressure (yes, it still happens decades later lol) and stay on track. I also repeated "not today, maybe tomorrow" which kept me sober day to day. Initially it was hard to imagine never drinking again, now I can picture the concept.
Best of luck and post often!