It Torments Me Terribly!

Hello. If you help me at least a little you will make me really happy! I will be very grateful to you, because this problem of mine bothers me a lot! I am 12 and a half years old, 6th grade and I am already studying with this grade in the 2nd year. In the beginning I was very close, I didn't talk much with the others, and I studied everything from above with my "best friend", who after a while showed her true temper and our mothers stopped all relationships, as we did. I had entered in the most important group of girls, so to speak, and she (M.) began to get too annoyed by it (because they did not like her) and spoke badly about me, about my mother, my father, that he stole, lied etc. It was too much and I couldn't stand it! I was crying all the time at home and I started to think I was going crazy. I myself have changed a lot, so have they. Now I became human and showed M. that I was strong and her numbers would not continue. He still secretly makes me dirty. Please tell me how I could get revenge for this harassment !!! THIS is the first thing, and the other is that I am very vain. I constantly criticize myself and say to myself that I am nothing special, that other girls are more than me. I'm also one of the shy ones. I secretly say to myself that I am great, but for a very short time ... HELP ME! Every 1 of your advice / opinions, etc., know, I will appreciate it a LOT! that I am nothing special, that other girls are more than me. I'm also one of the shy ones. I secretly say to myself that I am great, but for a very short time ... HELP ME! Every 1 of your advice / opinions, etc., know, I will appreciate it a LOT! that I am nothing special, that other girls are more than me. I'm also one of the shy ones. I secretly say to myself that I am great, but for a very short time ... HELP ME! Every 1 of your advice / opinions, etc., know, I will appreciate it a LOT!