Answer:
Hazel might mean the diease that is slowly killing her everyday and god knows how many days she has left compared to the kids who are getting boyfriends and girlfriends and living life carefree. It then gets worse when she meets Augustus and she falls in love with him and he shares her way of life. They have a connection and his sickness kills him and she's alone, again. The worst part was everyone knew he didn't have much time to live because he was so sickly. This made Hazel angry and sad because nothing could be done.
Explanation:
Hope this helps