I had things on my mind? And i need advice from girls? i mean what would you do?

Okay im not a very social person but i can be. I am very shy around the guy i like. . well i dont like him i just think he is so cute. okay not that cute but enough to to be likeable. or crush you know? But hes those wannabe kids so idk. anyways. the point is sadies is in 2 months and i have another dance on feb 5 and i wanna ask him i mean how would you ask him? The thing is im afraid of being rejected. . i dont know why. but before i think he use to like me because when we walk p each other we would smile but i kinda miss that since he doesn't do that anymore and hes totally different but i see him the same way still it doesn't changes! Do you think he'll go with me? I mean Im out of my mind like i dont know how to explain it but i wanna ask him but what if he says no then its a no right? but what if he says something to me like he has a reason cuhs like" your asian" or because "your too short" or because idk everything is running in my head. My friend said on sadies i had to ask someone because she is. she is so down . i told her i was going so i kept that promise.i pinked swear it. -_-:. last year was the same too. but idk. i didn't go i was like um im sick i cant dance. but i want this year to be good. so imma go i just wanna go with my friends but she said No. and stuff idk dude but it be cute i even agreed to it but im just a bigg chicken! D: i cant help it what should i do?!