Erm can y'all give me advice?

So there's this guy I consider to be one of my closest friends. He's nice, chill, and understanding. Before hoco, he asked me to go with him and I told him that i think I like u but i'm not sure so we should go just as friends. During hoco though, he wanted to talk with me alone and confessed to me and said he wanted to date. I told him again that I'm unsure of my feelings and don't want to hurt him in case I don't like him back. He says he's fine with taking his chances and we should trial date to see if my feelings would change and I agreed. So now we're kinda dating but if I actually feel sick. Like when I think about it, I feel like I'm going to vomit. I don't think I'm ready for a relationship. Give me advice plz