I feel nothing about my stepmom's death
Is it because you both had a history?
Like all other people , I was sad for her death but not much.
It's rude to say you didn't feel anything after death of someone in your family. I understand that she was your step-mom, but still she was family.
I hate her for what she did to my mom and myself.
I'm sorry for what you went through.  That being said, she's gone now and you should let go of the anger you're feeling.  It'll only hurt you in the long run if you hold onto that hatred.