Does this make me an alcoholic?

So I'm 22 years old, and I have 2-4 drinks almost every night. I don't normally get drunk, I probably get drunk like once every 2 months. I like to have drinks after a stressful day of work, and I feel like I need some alcohol during social events to help relax me (I have social anxiety to an extent). Does this make me an alcoholic? I've always thought alcoholics couldn't stop drinking once they started, to the point of drunkenness all the time. But I'm a little worried about my daily drinking even if I'm not getting drunk, and my need for it during stressful situations/social events. Should I be worried?