I have multiple friends slipping into alcoholism and it terrifies me
Why do you think your friends are slipping into alcoholism?
It must be something that's happening at school. I think school can influence one's behavior heavily.
Its great that you care about your friends in this way and are concerned about them. Maybe reaching out to them would be the best thing to do, and you can find out how to help them avoid the lure of alcohol.
Nah, I won't reach out to them.
I don't understand why you don't want to reach out to your friends.  You obviously care about them, but are you afraid that the same forces that are dragging them down will lure you in as well?  That is nothing to be ashamed of, but maybe you could enlist some more help.