Who am I?

Hello, everyone, this is my first book. I hope that it does suit your taste.
This story is about a girl who grew up with a painful past and thought her life was normal until an event came to take in place. She is not the person whom she thought she was but instead she found out that the real her is a danger to others and her. The people have been looking for her for decades and they won't stop until they have her. It seems that she possesses something great that holds a key to something bigger than she could ever imagine.