Welcome to the forum,
I was about the same way as you, no anxiety, no depression or insomnia etc. I never felt like I needed to medicate any mental illnesses or whatever. I never ever binged a whole day or drank in the morning to take the edge off. It was a night "enhancer" as I so thought.
I'm glad you figured out your problem when the AV tells you that you need more. I never really thought I had a problem when I got that "I need more to keep the fun going" thought in my head. However after quitting alcohol a whole mess of problems came up showing that I indeed had a dependency issue.
congrats on the 3 weeks