Tissue Paper

I am not a piece of tissue paper which you can use whenever you want to.
I am not a piece of tissue paper which you keep in your bag.
I am not a piece of tissue paper which you can use only when you need me.
I am not a piece of tissue paper which you can throw me away when you don't need me anymore.
I am not your piece of tissue paper.
Now, get that straight to your head.