I'm not judging. There are obviously valid reasons why this happened that you can't currently help - or you'd never have done it. Please forgive me for being so blunt, but it sounds to me like your mother is also abusive. What she told you is very wrong. You don't deserve the abuse. I can understand why you are in pain.
Please seek help asap. You may want to start with a helpline like The Samaritans or a similar local telephone or email service where you are regarding suicidal thoughts/feelings. You may find it easier to put your experience in writing rather than speaking it out - at least to start with.
I'm so very sorry you were put through what you were.