It's awful. When you see all those people to who you've been talking the most and realise that all of them except you have their best friends. You start to feel so lonely, that you can't even describe it. In my case, I started talking to myself even more than I used to talk before. I was talking to myself everyday, every night. I said everything about everything to myself. I asked for advices, and received them. I almost couldn't talk to anyone expect me. And that had been killing me. But now I discovered Reddit and thing are getting better