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"No means no" and "only yes means yes" seem to be two camps of thought when it comes to determining rape vs unwanted sex, and the debate is naturally contentious. However, Mary-Ann, determining your country's policy may clarify the legal definition of what happened to you. Regardless, I think that whether YOU choose to identify what happened as rape or not is up to you, but it was clearly something that had a very bad effect for you. That effect--not the clear-cut definition of the incident itself--is first and foremost why I urge you to seek counseling/support.
Understand that if you are in the US and choose to report this as sexual assault, you will probably have a lot of options (e.g. Do you want to report to police or the college admins), and you should know your rights in that process. A counselor or advocate can help you navigate those things, which is another reason it may benefit you to seek support on campus even if you're not currently interested in reporting your experience.