If you're accused of sexually assaulting another student under your college's sexual misconduct policy, the first thing you should do is to take the necessary precautions. You should also tell your parents, first and foremost, you should not go through such a process on your own. Too much is at stake. You cannot depend on the school to be looking out for your interests or rights. Schools often do not do the right thing, regrettably. You need to have somebody in your corner that can look out for and protect your interest, that can let you know what steps need to be taken, what steps need to be, say, potentially avoided, or what missteps need to be potentially avoided.
You need an experienced attorney advisor helping you from as early as possible in the process, but don't make this mistake of engaging in a conversation or a meeting with the school or campus police or anybody else for that matter until you can take the necessary precautions. That day may very well have to come, in almost all instances it does, but it should only be done after you take the proper precautions.