Answer:
Everyone has me, but nobody can lose me. What am I?
I spend the day at the window go to the table for meals and hide at night.
I am of several different kinds, but the one you pick doesn't do its job. What am I?
People walk in and out of me. They push me and I follow. When they walk out on me I close up and I stay waiting for the next person to walk into my life when I have a more open mind
You can read me both ways I wear; One way it's a number reversed a snare.
No matter how little or how much you use me, you change me every month.