Dear your book Dying girl and Bad Boy is an awesome concept but you need some work on it. Differ chapters by writing chapter names and they you titled it really needs to be differ.
Dear Sweetheart,
To turn your awesome idea into a book
Give proper bio, then give proper prologue, then continue chapters by titling them, then epilogue and then the End.
Please work on it. Else your concept is awesome
Lots of love