You're not alone you just can't see me

In celebration of my book I finished and am getting published I decided to make a fitting little story. This is for you guys; it is what you make it. I leave enough information out for you to fill the blanks in yourself, but enough intriguing story to spark your imagination. It's very... simular to the theme of my book just in 1st person not 3rd and not as detailed. This character is not described as a she, he or it and they can be whatever you want them to be. Look however you want them to look. I really want your imagination to run wild here, and let me know about it too! Anyways, enjoy.

It's never the little things, is it?
We always say it's the little things but it's not.
Because as soon as the little things deal damage
they're no longer little things, are they?