What am I?

I am a ghost floating silently thought these halls with no one noticing me.

I am a punching bag who takes your criticism without fighting back.

I am a doormat who lets you wipe your shitty feet on my heart.

I am a sandbar letting your waves of anger pound and roll over my head.

I am a dog bound by its leash, where you go is where I go.

I am your daughter, but I don’t feel like one.