findingreason, you should talk to your Resident Director and the people over at the Housing/Resident Life Office at your school, as Kara suggested. I transitioned in college, actually went full-time my second year there after being on hormones for 6 months. Over the summer I worked with the Resident Director on campus on a gender-neutral suite in one of the residence halls (I was already working on a gender-neutral campus campaign at the time), and that fall I moved in to the suite. They were very accommodating, and I had my own room, and although I shared the suite with other roommates (ended up being all girls too, on the girl's side of the floor), there were never any problems, including the shower situation.
Best of luck!