Not nice to be nice

You know it's not nice to be nice
Every act of kindness surely carries its price
I've never really been that kind
Thought I meant to make it straight from the heart
Starve the hate and now it's ripped me apart
I'll stay inside for awhile
First to know the sickness of doubt
Drop it for dead when you figure it out
You can leave anyone behind
Fixed myself, I don't even care
To kick or avenge you know I'd never dare
They'd kill me by the end