If you feel that you drink too much, these steps may help you quit drinking.

[edit] Steps

Do not buy groceries and alcohol at the same time.
Pick a day on which to drink (this means don't have a beer or a shot or get buzzed in between). If it helps, privately write down how you felt all week until your first drink.
On your designated day, before you drink, or get ready to go out (you might have to really, consciously put effort into this): read/remember how you felt all week, the highs and lows.

[edit] Tips

Keep chocolate handy. Chocolate cravings are typical when problem drinkers quit. It will increase your endorphins and help reduce the urges you will feel.
Why alcohol is taking over your life is a question that will only be answered when you DON'T let it take over your life.

Don't cut way down right away, or you may go on a drinking binge.
The booze has your life, and will fight to keep it.
A chronic alcoholic who quits all at once can be at major risk for health related issues. Abruptly stopping many CNS depressants can lead to something called "delirium tremens". Within a few days of going "cold turkey" withdrawl symptoms can progress to tonic clonic seizures and eventually status epilepticus. This can be fatal. If you are a chronic heavy drinker, before going cold turkey consult with your physician. They may be able to give you something (i.e. a BENZODIAZEPINE) along with a program to help cope with the acute withdrawl symptoms.