I want to be mean
Why do you want to be mean? What do you get out of it?
I want to feel the power I have over others
I think you should examine your motives. Feeling power over others may be seen as a narcissistic behavior and I wouldn't want you to be a narcissist so I recommend that you try and be more kind and stop thinking that you need to constantly have power over others.
I can be mean if I want, who cares? Why should I have remorse for anything I do?
Because people's feelings can get hurt and if you were them, you don't want to get hurt, do you? That's why I think being remorseful about your mistakes is a healthy way of living and that way you should make amends with people that you have hurt in the past.