To what extend should I keep doing useless stuff with my friends?

Recently my behaviour changed a lot thanks to buddhism. I am no longer interested in watching movies, listening to music, and especially going out on parties and drinking alcohol. This is creating a huge gap with my friends. My interests don't match theirs anymore. I tried to speak about the reasons why I feel better now that I left all these trivial activities behind, but I lack eloquence and thus didn't convince anyone. With my girlfriend things are easier because I can communicate a lot better with her, but I can still see that she suffers when I don't want to participate with the same activities as her. Should I accept to do trivial stuff from time to time just to stay close to my friends and not cause them suffering ? Following the noble eightfold path should make me easier to live with, but I just cannot watch TV one hour every night with my girlfriend anymore, nor can I spend my entire week-end going out and get wasted with my friends anymore. People around me find me boring and pressure me to do stuff I don't like anymore. On the other and I feel great compassion toward my friends and really wish to help them. If I stop seeing them, it would only cause more suffering. How can I adjust so that I can follow the path and not alienate myself by refusing to drink alcohol and watch tv ?