I'm not myself with him?

So me & this boy have feelings for each other and we went to the movies (the first time we actually hung out) and he was really sweet. We've been hanging out in school (we're in high school) and it's kind of awkward. I mean I'm not nervous around him but I'm not myself with him nor do we act like we even like each other. I feel like I'm just another friend& I told him how I felt and he said we should flirt more in person but he still doesn't.

I have this guy best friend and were always so goofy with each other and have fun. And he likes me but I said I like someone else. I wouldn't like my guy best friend but I don't see why I can't be like that with the guy I like .. I bet he's goofy too but he's just been more serious .. But I really like him. What do I do ?