I like a guy how do I tell him?I don't want 2 try anyting wit em,I jus tink he mite b da 1.?

He moved to another state but we keep intouch,and I want to tell him I like him.He said he's coming to visit me.But I'm only 15...I'm not ready 4 a relationship,I just want him to know when I am ready to date and get married he'd be the one I'd pick.He's really sweet and loyal,and he's funny too.I do talk to his parents alot and they are very nice.My mom and grandmother keeps tellin me I need 2 tell em,but shouldn't I wait till I'm comfortable or should I take that chance when my hearts beating triple times?