What should a child do in case he/she is abused?

What you need to do, when you find out that someone is sexually abusing you is SPEAK OUT. Reach out to your parents/teachers, friends immediately. Not talking about what you are going through will not make things easier for you. You need to also tell the person who is doing that to you, that you would tell your parents about this. A lot of times these could actually stop the abuse. However, if it still persists, please speak to your parents/teachers/friends immediately so that they can help you out.