The reason you're "stuck" in the habit of over drinking is because your brain is afraid of change and the unknown.
Here are some obstacles that your brain is convinced are true facts. They probably sounds like:
I'll start tomorrow.
I have a wedding coming up in two weeks, I'll take a break after that.
I have a romantic weekend planned with my husband, I'll make a change after then.
I have a business that needs my attention first, after it's settled I'll have time for myself.
I can't imagine not drinking on the weekends.
I can only unwind with a drink.
I broke my commitment for Dry January so I might as well keep drinking and start in February.
I don't have enough money- (ask yourself how much money do you spend in on alcohol and alcohol related activities over 2-3 months? What would happen if you shifted that money and invested it toward your mental health and well being that will give you infinite life long gratification?)
...plus a bunch more, I think you get the picture.
You think these thoughts, you drink = success!
The lower brain gets what it wants, alcohol=dopamine reward.
It's like giving in to a child throwing a tantrum.
All of these thoughts are so convincing because your brain is deeply committed to the reward it receives when you have a drink of alcohol. Your brain thinks it will "die" without the reward.
This "fear" is part of our primal brain and its job to help you stay alive. The problem is there is really no real danger. But your primal brain doesn't know the difference because it hasn't caught up through evolution. It knows fear, it processes it as if it is life threatening or not.
Your fear of change begins with a thought. As long as you keep creating these sentences in your mind (and rewarding them), you will be stuck.
You might think it is impossible to rewrite these thoughts/beliefs, but, YOU CAN change your beliefs. You just need to focus on a new way of thinking and embrace the fear of discomfort that you think you can't handle (because your primal brain thinks it will die).
You can rewire your brain.
I'll tell you how.