Why is it that no girls don't want to date me?

Because ive been rejected for all these years and there aren't any girls that are attracted to me ive been rejected by every single girl i liked.And now i don't know what to do i know if i was good looking i can get a girlfriend but now every girl thinks im the ugliest boy on earth and i don't know who likes me because it looks like no girls do i thought this 1 girl liked me but she doesn't anymore she likes this other boy and now i feel so heart broken some of my friends said the right girl will come but they are just saying that so i wouldn't feel bad.I see a lot of boys who haves a girlfriend even my friends and it just bothers me that they have someone and i don't.Now that ive been suffering so many rejection im so heart broken and im loosing my self confidence.So please give me some good advice i don't want to stay single i just wish there would be a girl who would like me for me.So what should i do?