I think that only you can answer your question. But if you are questioning if you are an alcoholic or not then it means something is wrong. It is bothering you.
Does this sound like an average 19 year old, or the makings of a problem? I want to stop myself if I'm headed down the wrong road.
If you are an alcoholic then there's nothing much you can do but accept your addiction. If you are not an alcoholic then definately limiting the amounts you drink is a good idea before it is too late. For me, it is not how much I drank as much as what happens when I drink? When I drink bad things happen. At the end I reached a point where I wasnot ready the price I have to pay for having that drink. The consequences were too much to bear. This is a progressive disease where once you drink things will start getting worse and worse till you either quit or lose everything you have. It is your choice and no one can tell you what to do. We can only be here if you need our support.