Does this make me a bad person or an alcoholic? Please read. I NEED advice!?

I only drink about once or twice a week while I'm in school (I'm a straight A student), but on my breaks in-between semesters I drink upwards of four times per week. Sometimes when I get drunk I'm fine, other times I'm really emotional, and other times I'm physically violent. For example, last night after chugging a pint of vodka in under a half an hour I punched my boyfriend in the face for not wanting to have with me. Do you think I'm a horrible person, an alcoholic, or both? Should I quit drinking altogether?