Good for you for realizing at such a young age that you have a problem. I was like you at 21 too. I wish I had had the internet back then to research things and talk to others who wanted to quit. There is a lot of information out there now and great places like this.
Dont be like me and wait till you are almost 50 to quit. I have ruined my health, and many relationships because of my drinking.
Just quit, and find new, non drinking friends. Luckily you have lots of time and a long life ahead of you.
You are very smart for seeing the problem early and addressing it.