Is drinking 5-6 large vodka drinks on saturday and sunday harmful?

i am a 21 year old fit guy having a nice body weight is 90 kgs and height is 6 feet.i do my gym workouts regulary 5 days a week.but the problem with me is that on every saturday and sunday i drink large volume of alcohol.i am a regular vodka drinker and i conume aroung 5-6 large drinks on saturday and sunday.i am not able to avoid it in holidays.please tell me what problems i can face and please tell me how to have a mind set of consuming less quantities of alcohol in a accurate way?thans