You can’t ignore this problem. You recognize that you are having thoughts of wanting to hurt or kill people. At this point in time they’re only thoughts. You have done nothing wrong and have not committed a crime. The most appropriate action you can take is to see a psychiatrist or a mental health professional. I understand that you are angry and depressed and that it’s difficult to endure the cruel words of other people. Anybody would feel upset and angry if they had people making fun of them.
What you cannot do is let these individuals run your life. You’re letting them get you upset to the point where you’re actually considering committing a crime, a crime that will likely land you in prison for the rest of your life. Are these people truly worth you giving up the rest of your life? Are these individuals worth you spending your time in a small prison cell closed off from the world just so you can get back at them for saying mean things about you? The answer to these questions is absolutely no; these people are not worth you losing your life for.
Please consider making an appointment with a counselor. With the counselor you can talk about how these words make you feel. You can explore in counseling why they make you so angry and you can learn a different response to your anger. You can learn to manage your emotions in a manner that is not detrimental to you or others around you. I hope you will seek help immediately. Jails and prisons are filled with people who recognize only too late that there are other ways to deal with anger. Don’t learn this lesson the hard way. Be smart, be proactive and recognize your need for help now and not later when you’ll regret your actions.