Halsey - Control Lyrics Meaning

So basically she is left in her old house to find "treasure". The house was haunted with "shadows and monsters". She sits in her bed, scared of the information that she holds. She ends up being partially possessed by a demon and is fighting internally for "control". Her presence scares children and she understands why. The demon's power courses through her, therefore she is "bigger than her body". As she fights for control, she considers herself meaner than her demons. As time passes, dhe becomes "acquainted with the villains in her head", and if they continue to coexist, they will each be immortal.

This is just how I think this song would be as a story... please don't judge me...