How can I be happy again?

I have had the same best friends for forever and then someone did a bunch of awful things to them and they started suspecting it was me hen more things happened they were convinced it was me and so they dropped me as friends (don't say they weren't real friend because they were and even though I didn't do it they had reason to believe it was me) they started being really mean to me and then just flat out bullying. After summer vk everyone is no longer mean to me and actually are nice but still don't want to be my friend how do i get them back I've apologized a million times. I've made new friends but there not really my kind of people their kid of strange sometimes and don't make me nearly as happy and included as my old friends did and our grade is too small to find anyone else to be my friend. I spend to much time wondering what could have happend and wound up becoming depressed it takes effort to smile I don't laugh very much and cry a lot when I'm alone how do I 1 win them back 2 become happy again. Please answer soon thanks :)