Story Challenge ACCEPTED!!!

Nightmare

Have you ever felt like...you weren't, you know, you? As if another soul rested within your own...
Twisting the fabric of your very own perception of life?
Ahaha...course not...I'm just babbling...
First things first, I am how you humans call...a Watcher? Half angel, half human....does that ring a bell?
We never called ourselves that...we always thought that we were human...
Oh, what do I know, I wasn't there...
But HE was there...
Oh, who is he?
     The men in my family are all Watchers, residing with humans as punishment by our dear lord for disobeying...
Some of them had it really worse...
You know the Four, right?
The Horsemen, Harbingers of doom?
No?
Well, their names are War, Death, Conquest, and Famine... They were Angels, well, their souls were angelic...
Until they were given the job of being the Horsemen...
My ancestor started this curse, he was the first watcher to disobey, so he got the worst punishment...
He had to split his soul with one of the Horsemen so they could live on and bring up the apocalypse...
Of course, his dumb ass got War, the worst one of the 4...
And here I am...the first female watcher...my coward father left before the ritual could be completed, then I was given the bastard's soul.
Now it feels like there's two souls in me..
One is mine...
And the other is an unholy terror, hissing for me to fight others and relish violence...
I can't with this anymore...
I'm not myself anymore...
I'm not a nightmare...
I am the nightmare...