Stitches

When I was a child, about 4 or 5 years old, my parents were murdered, I was sent to some horrible place I still don’t know the location or name of. In there the nuns or whatever they were stitched up my mouth. But later on they did it to everyone else.
Over there they trained us to kill people without mercy or hesitation. Everyone, but me, failed and got punished with endless torture.
They created a monster. They created me.
Every day they let me out at night to kill someone, anyone, and bring with me, after I’m done, a finger of my victim.
After time they let me live my own life but I should kill a person everyday and bring them the fingers.
In total I killed over 4 thousand innocent people. I hate myself for it. I tried escaping them. But they put a tracking device in me. Basically, it's now my blood. They know my every move. My exact location.
At first, people made fun of me for not talking, but they didn’t know that I physically can't because my mouth was stitched.

I was always wearing a hoodie and mask with some jeans, I never wore something that didn’t cover my whole body because while I was at that hell hole they also tortured me to make me feel no pain, physical at least.
The children tried making me mad or talk to them, or just give them some sort of emotion. I didn’t though, I just ignored them. After time they got bored of me and I finally became invisible.
I continued killing people with no one suspecting me, the new, quiet kid. Until one day a video was uploaded of a hooded person killing some teenage boy from my school. It was seen that the killer was pretty young and it was most likely a teen girl. All the suspicions went to the girls. Everyone stayed away from each other. Girls away from girls. Guys from all girls and some guys.
Police came to every school in the city and when they came to my school they questioned everyone,every guy, every girl, everyone.
When my turn came I as always stayed quiet. I had my mask over my mouth making