There are many more wiser and more experienced people on here than me and if you look around on the site you will be able to get great information. This is just my own criteria:
Do you think about drinking on a daily basis? That includes thinking about wanting a drink, about why you drank so much, about how crappy you feel from drinking, and about quitting drinking.
If the answer is yes, then most likely you have a problem. I came to this short, to the point criteria after I stopped drinking 5 years ago. I never realized that there are people out there who never give alcohol a second thought during an average day. I was actually shocked. 5 years later, now I understand. Most weeks go by now where I don't even think about alcohol, the subject never crosses my mind. But, when I do... I know my answer has to be NO. I can't drink. For me 1 leads to 2 and 2 leads to not being able to stop until I blackout.