What to say to this guy if I'm shy?

OK, so there's this guy I met and he wants me to call him. I want to but because I'm really REALLY shy, I don't know what to say or how to even start conversations. Any tips? Btw, I've never really talked to guys like this before either so that's why I'm so clueless.

dont think anything of it, see him as another friend that you talk to and see all the time. talk about how your day was, and how his day was. you dont always have to talk about sexual activities when you meet someone or like someone. intimacy is always a good thing. just talk about things you like to do in your free time, favorite foods an colors. ask him about all of his favorites. let him know what kind of person you are and find out what kind of person he is. just talk about everdya things. If you do that, things should naturally flow