I dont know what to do?

Maybe you should go to a therapist. If you can talk about what you did, and if they can talk to your mother about it, maybe she will think, and will start to help you a bit more. It's natural for siblings to argue and insult each other, but maybe you should tell them that they make you feel the way you do, and ask them to help you. Try this website. http://www.itsgoodtotalk.org.uk/therapists/