The true reality

So, this is basically a story about stuff that actually happened to me but kind of dramatised. I'm still working on it, there are already seven chapters so I'm going to upload them in a few hours or even minutes. I'll start with the intro, please tell me what you are thinking about it to help me to change stuff and also to improve my writing skills. There may be grammar mistakes (since my mother tongue is German), if so, please tell me as well. I would really appreciate your help.

Introduction
Rin was a little girl, rather small for the tender age of 16, always happy and caring about others but little did they know that she was suffering most of the time. All of it started back then, when she was just 6 years old she already tried to commit suicide but she was saved - her big brother, Chris... He grabbed her by her arm and pulled her away from the high cliff once he noticed that she was gone. He had always been there for her, they were inseparable until he met the love of his life, since then everything just got worse. She had been lonely since then, not being able to deal with the pain anymore since she was all on her own. Nobody would understand her, her friends would only ask her for favours and would only come to her if they needed something but she still accepted them as her friends because it was better than getting bullied. She made a big mistake back then, she bullied others, not thinking about the consequences, until now, as of late she has been getting bullied by her old classmates. She didn't know that she would have to go through such a terrible time of school - her childhood was hard enough for her and not to forget about the moving away from her old hometown, there was only one good thing about it, Rin would be able to get away from home, her old classmates and every person she had met until now. The bad thing was, communication is something she was terrible at, what is she supposed to do once she arrives there? And what about her new job?