Welcome 4llison.
Know exactly how you feel. The culture here in the uk amongst my age group sees getting absolutely hammered and making a fool of yourself as a badge of honour. In fact, alcohol is glorified massively, not by everyone but by a significant amount of people.
I've had to cut away during my many attempts at quitting from my buddies who I drank with. I still retain a few who will engage in non alcohol related ventures with me, but am on the lookout to make new sober friends.
It's not as hard as you think, you can meet great people just by starting a new hobby, volunteering etc. I've come quite close to a few people at my work who understand and would never pressure me to drink.