Crushing :0!

Omg I need help with this :'), I have this guy I like right, he's in my friend group and we do talk and share a class together and sit next to each other, we're also going to meet up at the mall on Sunday, I really don't know how to really tell him, he's very sweet, and smart and in general a really good guy, AND its also our senior year, what if I don't have another chance to find a guy like him. I want to tell him but at the same time I feel like I will ruin our friendship and our relationship, and I don't really want to make him feel uncomfortable to be around me if I do tell him:(( what do I do? Do I tell him? Or no?