What Am I?

Chapter 2

I guess I should introduce myself. My name is Alex. I'm a 17 year old run away with a terrible past. I was born to Sarah and Jack smith. Sarah was a stripper, and Jack was an extremely abusive alcoholic. Jack would always beat the shit out of my mom during the day while I was at school, as soon as I got home and my mom went to work, his abusiveness would turn to me. He wouldn't touch me in front of my mom. She threatened to kill him if he ever did.
Anyways, after my mom would leave, he would come into my room and start yelling at me. I wouldn't say anything. I'd just sit there on my bed. And it would piss him off. He would smack me so hard I'd fall off my bed and onto the floor. He would then pick me up by my throats and slam me into the wall and hold my there, choking me. And he would just sit there and beat on me. After he was done, he would tell me "boy if you ever tell your Bitch mom that I hit you, I'll fucking kill you." This went on until I turned 16.
Growing up with a stripper mom and an abusive "father" wasn't easy. Anyways one day I came home from school and jack was in a more pissy mood than usual. Him and my mom were arguing, as usual. He called my mom a stupid cunt and slapped her so hard she fell over the coffee table. I had just walked in the door to see this. Rage filled my being. All I saw was red. I ran across the room and jumped over the coffee table and started to beat the shit outta him. We toppled over the couch and fell to the ground. I landed on top of jack and continued to slam my fist into his face. Blood was splattering everywhere as I landed punch after punch. My mom had gotten to her feet and started trying to jerk me off of jack. 
"ALEX... ALEX GET OFF OF HIM"
"STOP HURTING HIM ALEX. ALEX GET OFF."
In my fit of rage I threw my mom off of me and kept hitting him. Jacks eyes rolled to the back of his head, his face, my fist and arms, his shirt and mine were soaked in his blood. He was missing several teeth, his nose was broken in several places and his eyes were swollen almost shut. I slammed my fist into his skull twice more before standing over him.
"Don't you ever put your goddamn hands on my mother ever again."
I stomped his face with my boot. I turned around, grabbed my shit and walked out and I left home.
It turns out my mom had taken jack to the hospital. His skull was fractured in several places, his nose was broken, he was now missing most of his teeth, and his jaw was shattered. He was put into ICU. He died after 3 days in there. And I was responsible for it.