The biggest worry I have is that so many people (you included) don't know what an "alcoholic" is.
An alcoholic is a person who is addicted to alcohol; whose body depends on it. It has NOTHING to do with how much they drink or how often. There are many "alcoholics" who don't drink at all (they knew the effect it was having on them so, with a struggle, gave it up completely). A lot of people who post here (I'm guessing young kids in America) think "an alcoholic" is a heavy drinker. A person could be both, but they are two separate things.
Your family and friends are far more able to tell whether you have "a problem" or not than strangers here who don't know you (especially when so many of the strangers know so little).
To me, a litre of spirits over two days is a LOT. I guess you are young and I'd be concerned about how much you'd be drinking in a few years time. I've had times when I've drunk far too much but never as regularly as you seem to. I've never drunk that much EVERY weekend or every Friday or whatever. It sounds like a habit to me that you're reluctant to break. I have a friend who is an alcoholic. She went around two years without a drink at all (whilst waiting for a liver transplant), being able to go for five days without a drink isn't anything - the alcohol will still be in your system for part of that time. Regular binge drinking, which is what you so, is never a good thing. Believing that you could stop and that you wouldn't miss it makes no difference unless you do stop. I'd certainly say that you need to cut down and change your pattern of drinking.