Grab your chance for freedom! There's nothing you can do to help your father get sober. He has to decide to do that for himself, and it looks like he currently has no interest in that.
The best thing you can do for yourself is stop worring about something you have no control over and get on with your life. College will be a welcome diversion for you and it will put much distance between you and your father's drinking.
Now that summer vacation is upon you, it might be a good time to check out an Alanon group in your area. It will help you make the best decision for you.