Hello
Thank you for sending your letter in.
It sounds like what your friends are saying to you is upsetting you, especially because they are making things up about you. Sometimes friends say things which they think are harmless, without realising that they are actually upsetting you. You could try looking at the message boards about bullying where you can talk to other young people who have been in similar situations.
You mentioned about your mum calling the school and this might be a good starting point. This will make your teachers aware of the problems you are having with your friends. If you don't want your mum to call the school then you could try speaking to someone like a teacher you trust and see what they think.
If you want to talk to ChildLine about this you can ring on 0800 1111, request a chat through the website or send an e-mail.
Take care
Sam