Introduction

PROCEED AT YOUR OWN WILL
I wouldn't read this if I were you
I wrote it when I was 14
It's so bad. I apologise

You can't see me, but I'm always around you. Run as fast as you can, but you'll never escape me. Fight me with all your strength, but you'll never defeat me. I kill when I wish, but can never be brought justice.

Who am I?