Hurt me, now I murder

I used to be one to cry like a child,
But my tears are no longer wild.
They used to tease and make me plea,
But now I'll make them fall to their knees.
Now the game has begun,
Now it's time I have some fun.  
You knocked me down,
And pushed me around,
But now you regret as I stand tall,
As I make you curl into a ball.  
I play your death in my mind,
and your body, the cops will never find.  
Don't worry about dying too soon,
Your soul won't disappear like a balloon.
I'll kill you slowly and torture you.
Dont believe me, ask my last victims if it's true.
You can try to run away,
But one day, I will catch you.