The circle of shame

I am a parasite. (I am in).
Your saliva (Is my skin).
When your die (I will be there).
To make your shit my food.

I crawl like a sinner (I am weak).
My skin is still thin (I see you through it).
I waste my place (In your heart).
I wasn´t the one who twisted nail.

I´m not inside.
I´m not here.