Moi.

Hope is without beginning.
Suffering is endless.
Darkness is ubiquitous...
Strength warps to take the weight,
And bruised consciousness conforms under the pressure.

Right, guess who. Yes! One of my personalities! Not quite, though. There is my personality around my friends at school and events and stuff, and then there is me at home, involuntarily recounting the factors of each and every day that imply that I do not, in fact, serve any purpose here.

My first, primary self is a music-freak, is rude, is cruel, and doesn't have regard to anyone's real feelings unless they are a decent person. Otherwise, hurting them in any way doesn't seem consequential to her.
The second, kind of subself is quiet, detatched, and humorless. She will make no contact with any other people with the state of mind that they are only there to supersede me.

These descriptions are unfailingly accurate.

Any questions? I couldn't care less.