Problem drinking isn't just about how much you drink, but how it affects your life. Signs of a problem include drinking more than you intend to, trying to cut back without success, experiencing negative consequences in your relationships or work, and spending a lot of time thinking about alcohol. It exists on a spectrum from mild to severe, and you don't have to hit rock bottom to seek help.
If you're questioning your relationship with alcohol, that's a sign that it might be worth exploring with a professional.