A quick note:

You were born to a family who didn't consider itself a family. Your parents lived together only because it was easier paying rent together.
You never did anything big to change your life. But you did dream.
You dreamt big.

A person can take that much till they snap. And you had enough.
You did what was right. As what was once wrong was now right, and what was once right was now wrong.
Welcome to the real world, dreamer, you can't get away that easily with a murder.