Feel so lonely

My bf dumped me 4 weeks ago and I miss him so much. Ik im only 15 but it feels like i will never find anyone else and that imma be alone forever. All my friends are in relationships so I’m always left out now and it sucks. It feels like I have Abso no one now and idk how to meet other boys and I juts really want my bf back but at the same time I don’t because obvs he dumped me and was really mean After we broke up and he wasn’t even upset about it. Idk what to do I feel like I’m going crazy. ESP cause its summer holidays now so I’ve got 6 weeks and I don’t wanna be alone the whole time.