Personman- I completely understand what you are going through. I was diagnosed with UC when I was a senior in highschool and was very nervous about
going away to college. My best friend and I decided to room together, and like you, we had to share a bathroom with another room and two people we didn't know. It was a blessing having my best friend with me because we could just make light of my having to poo more than everyone else. I was even given the title of "Bookie Queen." I was shy and embarrassed about
having this condition and it was really hard for me to tell people about
it. I ended up just emailing my suite mates telling them that I have UC and I gave them a link to a website that described it. They were very understanding, as most people will be. I also sent an email to my professors letting them know what I have. Suprisingly, many of them had never heard of UC and with my explanation of it, they were very understanding about
letting me leave class early, if needed. A lot of them even let me miss class all together when I was sick and would send me everything I needed by email. I hated feeling like I was getting special treatment because of it but, seriously...those of us with this condition deserve a little bit of special treatment!!!
I have learned that humor plays a huge role in helping me deal with this. As hard as it sounds, being open with people right away about having UC will be the best thing for you.