Just my opinion: I think 12 to 15 beers indicates alcoholism.
From 1993 to 2000, with the exception of a few months here and there, I drank every day. Drank about six to eight beers a night. I never could understand how someone could put away fifteen in a night. I never progressed to that. Of course, during all this time, I never worked a full-time job, did poorly in school, had no friends, and never drank with others or in bars, only by myself in my apartment. so i had alcoholic tendencies, most of what you describe fits the def. of social drinking, but i still think if you down fifteen beers, well that's screwy and indicates something gone haywire.
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