I've turned into someone that I hate.
What do you mean? What about yourself do you hate?
I'm a mindless troll. I only know how to bash people's heads in.
I can understand feeling upset about not being the person who you want to be or what you've become. It's not okay to have such low self-esteem about yourself, you should focus on the good in your life and as you as a person. Continuing look down on yourself is not going to help develop a good self-worth for yourself.
You're right, this is not okay. I'm going to kill myself.
Killing yourself is not the way to solve hating yourself. Therapy and counseling are. You shouldn't hate yourself, but there are better ways to deal with it than ending it.