Welcome to the forum, you’re in the right place! I shared your inability to moderate the amount or the frequency of my drinking. And I suspect you’re like me, that I fully intended not to drink in a day but at some point, I “changed my mind”. These things were the hallmarks for me of my alcoholism. And I was told early on in sobriety that a functioning alcoholic was in fact a drunk. That deflated whatever pride I was desperate to preserve.
What helped me the most to get sober was to recognize that I did not know how to stay dry nor how to be happy being sober. I sought people who did seem to be happy and comfortable with being sober and did what they suggested to me. Following through with each suggestion, with rare occasions of declining them, helped me change three things; how I thought, how I acted, and how I felt. I encourage you to find people who seen happy, serene and sober, to check in with them frequently, to try sincerely what they suggest. Trusting others and believing that everything is going to be alright have been attitudes that helped me grow a faith that I too can be sober and serene.
What I did to get and stay sober was to use medication (disulfiram, Antabuse in the US), individual counseling, participation in AA, and personal direct accountability for my sobriety. After some time I found this forum and it has become a pillar of my sobriety.
Blessings on your house 
as you begin your journey.
Here’s a couple of threads full of solutions.