A Shadows Life

I exist and everyone knows what I am, but I'm often forgotten.

I am always there, but go unnoticed.

I have no features of my own, and yet I can be seen.

I follow where you go and what you do, but no one ever does the same to me.

I am visible and always present yet no one speaks to me.

I disappear at night but no one goes to search for me or worries.