Hi Katie,
I understand that it's hard, but you should talk to your mum or a teacher, or another adult that you can trust, about what happened, because once you've told someone, it'll feel like a huge weight lifted off of your shoulders. That adult will be able to help you to forget about it all, and move on. I understand that it's not easy telling someone about that face to face, and if you find that's too upsetting, try writing it in a letter and giving it to the person.
Stay strong Katie, everything will work out in the end, keep your chin up!
Jimbo
Feel free to drop me an email anytime -
adviceline@london.com