Feel like shit every day because you drink every night, yet keep drinking every night. Consciously realizing that you need to quit drinking, but finding yourself unable to do it.
For instance, you say to yourself "today, I'm not going to drink anything because I'm hung over as shit", yet when that afternoon rolls around, your hangover has receded a bit, you're feeling like you could handle some booze after all, your earlier thoughts about not drinking get forgotten. Repeat every day. You're then starting to become addicted to alcohol.
There are stages beyond that as well, where you start thinking a little nip while at work might clear your head a little. Pretty soon you're drinking as soon as you wake up.