How long does it take to become addicted?

First time I really did get drunk was last week, on Tuesday. Then I got blackout drunk last Saturday. Since then, I have had like two shots a day (vodka) and I haven’t had anything today, but I’m feeling anxious and depressed, I just need some to calm me down, I need to feel numb, I need this to go away, I just keep feeling like I need it. I’m getting drunk tonight because I need these feelings to go