Crohn's disease is not as unheard of as I thought. When my husband was diagnosed, and I told people, a lot of them actually knew about it . . .they'd tell me such and such person also has it, or my aunt has it, etc. It actually really surprised me to hear so many people tell me that someone in their circle also suffered from it.
So, I wouldn't be surprised if they'd heard about it already. I think your friends will be cool about you abstaining from drinking, and will be happy with you just hanging out with them when your health permits. Also a lot of young people suffer from IBS . . . the stress of college can be a trigger for IBS flare-ups. So, they may be able to identify a little with what you're going through.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Canasa, Lialda, Remicade, VSL#3, Florastor
In Remission since June 2008
Stopped vancomycin for c-diff Jan 1 2009
C-diff free, until Sep 2, 2009
Fighting c-diff, I guess for life