Getting past the partying -- advice?

[dahlia_gc]

Hi. I have a sort of strange problem. I live in my sorority's house, and I'm starting my junior year. The girls I live with are big partyers. The whole greek culture here is the same. I don't want to party, but I feel a lot of pressure to from the girls I live with. Some of them are really nice about it and supportive, and some of them are just straight bitches. It's strange because I've always enjoyed a lot of friendship with everyone in this chapter and now some of them have completely ditched me, which really surprised me and (to be honest) hurt my feelings. I've been dating a great guy for the last 10 months and that started around the time that I started to slow down on the partying. However I think some of the girls think I've ditched them for him, which is not the reason I'm no longer getting drunk with them every Tuesday night by any means. He's just one of the only people I know now who is willing to go to the library with me, or even do anything that doesn't involve getting drunk. Not sure why it would come as a surprise to them, because although I used to go out with them a lot I wasn't a huge drinker and certainly never fell into the promiscuity that seems to be common here.

I just feel a little left out and I'm not sure how to handle their catty remarks and behavior. Has anyone had similar experience or has advice?