why

Why oh why won't these cravings go away? I do not want a beer, I do not want to be drunk, i do not want to be useless i do not want to be hungover and shameful in the morning. but here i sit at work and the thought popped into my head how nice it will be when i get home and drink a few to relax.. and then the craving, u know the one that is inside u, like starts and ur throat and goes down into ur belly.. the desire to drink "just a few" why does it have to be a daily struggle?