If drinking is a problem, stopping is the solution.
I don't think there is one definition of alcoholism. Three or four on a regular basis is still too many if you look at the guidelines for alcohol. It isn't necessarily that guy who drinks all the case of beer every night. It's an inability to control intake in some way. If you can't stop easily, I would be concerned. If it is a necessary part of life - it's a problem.
It will get progressively worse: it's good to get rid of it now.