You don't have to worry about "not ever drinking again." All you have to do is take it a day at a time.
I was 14 when I first enter the rooms of AA. I stayed sober 9 months and thought I was too young. I tested the waters again. At age 18 I was back in the rooms, but it took me 3 years to finally get it. The key was I to be ready to stop. At the age of 21 I took my last drink.
Age doesn't matter. All that matters is that you are willing to go to any lengths to stay sober.