The Insult Against A Friend

Hello. I am M.! My problem is with some girls from my neighborhood. I always argue with two or three of the girls because they dump me or lie to me. And today they called me in a cafe to talk, and they (K, C, N) called other girls to scare me. And K. and I had been in a cafe for a long time, and I showed her a story from my personal diary. It never occurred to me that she would see the bad things I wrote 2 months ago and she told a girl and today in the cafe where I was called, N. and Ts. Offered me to go to the toilet while arguing with the other girls, and they called me so the other girls could take my personal diary, reached into my bag and took it. And there's something in it that I don't want to show to a girl, but they tore up my insult sheet and didn't give it back to me. What to do, help. I don't know what will happen, because these things are PAST, and now they think I wrote it. HELP!