Do i have an addiction?

im 18 years old and work in a club. i have one drink after work but when i get home i can drink a bottle of vodka i feel fine and im never sick but the next day i wake up and cant remember a thing! i went out at the weekend and i was fine but when i wake up the next day i cant remember anything like this lad said he had seen me out and i cant even remember seeing him if i cant remember seeing him i could have done anything. i show my self up and i dont no what ive done hte next day. i never used to forget things i used to remember the hole nyt but now i drink alot more and cant remember it do i have a problem ?