First boyfriend....? Maybe

(F, 13/14). So this guys been flirting with me for the past couple days, and he said he has something to tell me next time we see each other .. he's really sweet but I'm not sure if I'm ready for a bf.. if I was to have one it'd probably be him but still. I also blush really easily so I don't know what to do. Whenever I think of him I panic cause he was so sweet and I really don't know what he sees in me and he wrote this long message telling me how pretty I am and that lots of guys like me, which I doubt.. anyway I'm super nervous because I don't do good when I'm around him and I kinda go into dummy mode, so any advice? Also any funny things I can say if he does ask me out? Cause when I'm nervous I need funny!

Thanks 😊