Am I doing a bad thing?

I (19m) dont drink during the week and only on weekends. I go out with my friends maybe once every 2 or 3 weeks to the pub. I go to the gym 3 times per week and run 2 10ks per week. I tend to ‘binge’ on weekends, if I am going out maybe 10 pints and if I am at home maybe 6, which probably equates to 15-30 units per week. I often feel guilty for drinking, but I really enjoy it as it is a great social thing to do. Do you think I am being reasonable or no?