I think the important thing to touch on here is not what others think nor what society defines as 'alcoholism', it seems that despite what you may play off as your friends giving you shit for is that you also notice a problem. If you notice an issue, fix it. Will it be hard? Absolutely. It will be easier to replace with another habit than just keeping the exact same life minus drinking.
If you want my personal advice - coming a similar situation - replace drinking with the gym. A real gym not weights in your room. Go full blast into it like the early days of discovering riding, shape up your eating habits if they are not very good, and replace all fluid intake with simple water. This does not mean go be paleo or a bodybuilder or some crazy IG fan crazed fitness guru. Just be healthy man. It will be pure shit for the first 2-4 weeks, there is no getting around it. But I promise you that you will A) start to actually look forward to going, B) you will feel better on a day to day basis among other life improvements, and C) you won't really want to drink after a month, I mean I still have a night out at the bar once in a bluemate moon with colleagues but I am by no means getting smashed those infrequent times. There are long term detriments to what you are doing drinking this much and there is no better time than now to halt it.