I don’t know anymore

It’s always fun for me to go back and read all my old emails and texts with friends but now I’m starting to doubt my choices. I miss my old friends and friend group. I miss when people were nice to me. I miss when I had good friends. And even now, yes, my best friend, but she has other best friends that she likes better than me and she’s openly admitted that, and now there’s a new girl in our friend group and they’re getting really close and it feels like she’s taking my place. I don’t know what to do. I just want to go back in time.