Obssesd nd die alone? I'm terrified w the... Pls helpppl?

So in a nutshell I loved a boy for 4 years n he rejected me:/ in the past I was popular n everbody use to love me:/ but know I feel all alone:/ I started college but still in love w him:/ I know it's stupid we even do not live in the same city anymore:/ its kında impos for me to love somnelse:/ evryone else has a fault etc etc:/ I have plenty of friends here but I feel all alone :/ I even have not had my first kiss yet:/ pls give me an idea to help me to change the course of my life :/ nothing makes me happy n it feel like Im gonna die all alone:/ Noone will ever love me:/