I went far with a guy... and now I need advice?

Umm so, I went to thid base with this guy today. I feel gross, I never do this. I usually date a guy for quite a while and even then I didnt go this far. We aren't dating, he just had me ove to his house today. I thought I wanted to go that far with him and that I wanted to have fun. Now, after realizing that I don't like him I've found that I want this innocent sweet guy (I feel so nasty). I'm a really innocent person and don't know what I was thinkin'. Anyone wanna help me?