I want to be evil but I don't want to hurt anyone's feelings. What can I do?

You can be evil in a broad sense. Seek world domination instead of hurting people individually. The best evil is insidious and seems "good." For instance, (in DC comics) Lex Luthor is not evil. In his own mind, he's looking out for the good of humanity against the evil "Alien" who has come from Krypton to enforce his vision of "justice" on our world. From a certain point of view, Lex is absolutely right... what if Superman were evil or, maybe, from a certain perspective Superman is evil? Similarly, Darth Vader is yet another person whose "evil", when put into context, seems as though he is only following his convictions. The best "evil" character is an anti-hero.