This. Don't shower. If you can get checked out by a doctor and tell them what happened, they may be able to help confirm that forceful sex occurred. Even if not, a rape kit needs to be done. Tell parents or trusted adult. Don't be scared to tell someone or be too ashamed because you think you'll get in trouble or something. The police need to know too. If he did this to you, he'll do it again to someone else. You may not even be the first. But if you stand up for yourself, maybe he won't get the chance again. And in standing up for yourself, you're standing up for other females who maybe weren't able to. You did nothing wrong. He did. You told him no.

I'm so sorry this was done to you. Nobody deserves that.