Welcome to the family - it's so good you joined us. You aren't alone - we all get how you're feeling. We've been there and understand. For me that was a huge help when I first joined here. I had no one else to talk to about it - everyone was a social drinker and didn't know why I couldn't just have 'a few' without getting trashed.
At only 20, it's very hard to come to this conclusion - I think you should be proud of yourself for reaching out. I tried to manage my drinking myself, and ended up with a ruined life. This won't be you, benc.
