You have great insight into your drinking, that's for sure. Good for you. You are absolutely right about the college drinking becoming more "sinister" as you enter your 30's. I was really good at rationalizing my drinking when I was in my 20's, thinking "everybody does it." It became harder and harder to rationalize it when I finished my 30's and entered my 40's. By then, it was no longer "fun" and NOT everybody did it. You are wise to want to do something about it now.
Very glad you are here. This is a great source of support.