This is a difficult situation and I have had similar struggles with my parents.
I don't know if this is the healthiest approach for the long term, but the following has helped me: avoid difficult people when you are struggling.
I imagine that you are busy during the day with school and are out of the house. On bad days, I would bring snacks and study at the library in the evenings. On weekends I would go to the library, spend time with positive people, and pursue interests. When I'm feeling stronger (no desire to drink), I would be more willing to communicate with them about noncontroversial topics. Explaining to them that you are struggling and trying to say sober could work, depending on the personalities of your parents (It would likely make my mom worse actually, which I know sounds bizarre, but is true in her case.)
Best of luck to you.