Hey, Silence. Welcome, if I haven't said it yet.
Other than that, I got this to say: if you think you have a problem, it's worth trying that 30-days of sobriety idea. That ought to make your problem /not problem clearer, and you really have nothing to lose. And this is coming from someone who is not currently very happy with a certain step-based program towards sobriety. I mean, if it's not a problem, 30 days won't be a problem. Otherwise, now you know where you stand, proceed as such.
And don't think that you can't be alcoholic at a young age. I'm almost 30, been drunk 2/3 my life--and yes, that means that at age 20 my small self could probably outdrink half the people in your town, male or female. Be careful, people. Alcohol is in fact your everyday average neighborhood murderer--I found that out the day I got a certain cross-border state's ambulance to deal with the fact that I should have died but didn't on a ill-advised withdrawal.