I don't know if it's just me, but I've always felt a lot more embarrassed talking about failed friendships than failed relationships. A romantic breakup can happen for a number of reasons that don't have anything to do with you. But if someone doesn't want to be your friend, they just plain don't like you, which is a much more brutal rejection IMO.
The thing is though, I know hardly anyone who hasn't gone through a friend breakup. For proof please read this, and this and this. Friendships come and go. You grow, you change, you fall out, you maybe make up. It's all part of life.
What I'm trying to say is: you're not alone. This year, I've made new friends, but I've also had some of my worst friend breakups to date. It was shit. But I'm ok. Every day, I get more OK. And believe me, you will be OK too.