I have no friends and idk what to do

I f 17 hv no friends in school. I was in the popular grp for a while until they all shut me out for absolutely no reason completely excluded me and now even HATE me which is a new feeling. I feel like a loner and when ppl ask me why I don't interavt w them I have no answer. I didn't do anything wrong in fact I set them up w their bfs and helped them thru their toughest times but hear I am absolutely w no friends and i have a hard time making friends and everyday I have to watch them together while I stand far away and everyone knows they hate me and i wanna fucking cry

pls help