Units aside, why do you drink 3 glasses every evening?
For me, the things I'd ask would be:
Do you feel you need it? Or that you've 'earned' it? Do you think about it throughout the day?
What happens if you don't have it? Would you consider not having it sometimes? Do you congratulate yourself if you have a day or two without alcohol?
What about the specific 3 glasses? Does that amount feel normal or acceptable? By which I mean, is it 'only' 3 glasses, do you use that amount to say it's not that much or everyone does it?
It's about dependence, attitudes and a whole range of things as well as straight quantity.
But really, if you use alcohol as a reward or a coping tool, or fixate to the degree that you can say how long it is since you last had a drink (during periods of abstinence), or fee you need to limit yourself in some way (perhaps with something such as 'only 3 glasses') then I would say you might have a problem with alcohol.
And maybe that's what you need to think about?