Yes, that's it exactly. We decide, we choose to quit drinking, and underpinning that is the fact that we MAY choose. When you understand that's how it works, you are on your way. Take a look around the forums here, and you will see many who believe that they are unable to choose. This is one of Trimpey's beefs with recoveryism.
Meanwhile, back at the RR Ranch, you have the ability to quit drinking, and you can choose to do so. You are here because consuming alcohol is messing you up. Believing these things, what does a rational person do?