You are at a difficult age, I realize that. But it sounds like you are in a small town where drinking in a wheat field is all that there is to do on the weekends. I would challenge you to do everything you can to stay sober this weekend. Live on this site, read, read, and read some more, and find different activities from what you usually take part in.
I am betting there are a couple of girls in your town that would be happy to head out to dinner or a movie with you and avoid the drinking scene all together. It is all about changing your thought process and routines, you can do this, you know that you should, and you know that you will feel better about yourself and the decisions that you are making.
You can do it, never be afraid to reach out for help, you will find a ton of support from people who have gone through what you are.