Sometimes I'm scared of who I am.
What makes you afraid of who you are?
There are inner voices who keep on haunting me to do something I don't want to do.
You shouldn't be afraid of who you are. You do, however, need to channel your inner voice to be more positive.
I don't know, I feel like I'm a terrible person.
You're not a terrible person and you should not be afraid, but you should think about getting professional help so you can work to feel and think more positively. You deserve to be confident and feel good about yourself.