Crush Diagnosis

Hi I’m 14 and I have a big crush on this guy who’s really cute and fun but doesn’t even know I exist I haven’t talked to him in a year I’m that scared. Loads of girls in my year are shifting loads of boys at discos and I’ve never kissed a guy. I really wish I could just be pretty and skinny and get a boyfriend and not stuck out anymore. Can anyone give me advice as to how I can get this guy to fall in love with me or at least kiss me