I dont't know an answer that works for everyone. Each person needs to consider for themselves whether they have a problem.
If you can just "enjoy a drink" you are probably fine. But once you start suspecting that you have a problem and making efforts to control it, and you can't, then you can be pretty sure that you have a "problem"
I quit almost 4 years ago, do you mind if I try and answer this question too?
While everyone is different, I knew I had a problem when I would wake up in the middle of the night passed out in a chair or on couch with TV blaring, all the lights on, and even candles burning. Banging into the walls on my way to bed, I wouldn't stop to take my clothes or makeup off or brush my teeth. When I would wake up in the morning, I wouldn't be hung over, (or at least I thought I wasn't) but I never remembered going to bed. This habit was repeated nightly for years and I knew it was dangerous and had to stop.