Maybe it isn't the right place for you. Maybe the people are more accepting and trustworthy than they seem (or could be if they began to shed some of their ignorance). Maybe (any of a million third options could go here).
I haven't been in that exact situation so I don't have any personal advice or promises of it-gets-better, but I read what you said and I can really sympathize.
I feel like if you want to be out, you should be able to be out. If that creates a situation that is unsafe or uncomfortable, then the option of leaving and finding a new school, or just a new dorm hall or something, might become something worth looking into.
Check around on your school's website (or Google) and see if there are any campus resources available to trans students. My school had a trans-inclusive Women's Center and a Queer Resource Center that both helped me immensely... sadly I didn't discover them until my fifth year of college.
You don't have to let the people in your dorm or program be the ones you are emotionally close with. I found my home with the people in those centers, after years of trying and failing to fit in with other psychology majors and people who lived on my end of the campus.