"Dating"?

Hey girls so I'm going for lunch with this guy who's in my Musical theatre tech class . He's made it clear he likes me. I like him too but I don't want to date him. I'm in grade 10 and he's in grade 9 the class is open so it's grade 9-12. We've never actually talked in person so I think talking for the first time on our "date" is weird. He thinks it's a date I don't.

I don't want to be mean. I'm shy too so idk how to tell him I just want to be friends. Please help

he's been snap chatting me alot tho so it's not like we've never communicated