Welcome, I'm so sorry you're going through this. I was about your age when I finally figured out what was going on with my Mother. It took her another 10 years to finish killing herself. It was like being invited to a train wreck every single day.
Two books that helped me..... "Trapped in the Mirror." The book is about narcissism, which may or may not be a part of your mother's problem. For my mother, everything was always all about her. From what I can tell that pretty much applies to any addict.
And "Toxic Parents." It's a tough idea, that your parents are not always trying for what's best for you. But it happens and this book helped me recognize the truth and begin to protect myself and my child.
Hugs and Prayers.