In my opinion, an alcoholic is someone who turns to the substance when things are bad, good, or in between. It is their way out. They may develop a physical addiction to the drug, or they may not. Regardless, if being able to control your drinking is out of the question, seek help. Even if you can have 1 or 2 drinks, but it's still on your mind, you're obsessing about having more. Alcoholism is a mental obsession, a disease that one can not help. Blacking out isn't normal (I thought it was while I was drinking!), and if you continuously make bad decisions while intoxicated, there is an issue. It's insanity to keep doing something and expecting different results.
I hope I helped answer your question