If you have to ask, you probably have a problem with alcohol. I won't say you are an alcoholic, that's up to you to decide.
It doesn't matter what you are drinking but how much. You could have issues with binge drinking if you don't drink every day, but when you do, it's a lot.
It also doesn't matter if you drink alone or in a social setting like a bar.
If stopping proves difficult, you might consider outside help like an AA meeting or a frank talk with a Dr.
If you physically feel ill when stopping drinking, you may need a supervised rehab.