50 shade of depression

life is not easy. we all face problems everyday sometimes we are broken by our close people. but does depression has any age? like people think youngsters can't be depressed. is it so? this story is about a girl sara
depressed at the age of 10 , she healed her self by her own but the problem she faced was not easy . no one to understand and fake friends, abusive parents and more. but her luck was good that her crush Sam understand her but can't do anything about this because of his girlfriend. Sam 's GF Bianca was the one who made sara depressed.
but the question is why was she depressed ? what's made her like this? what did bianca do to her?

wanna know the read this book.