How does a guy quit being sensitive?

I'm a highly sensitive person, although I'm always nice to people whenever someone is rude to me (lucky for me I surround myself with good people so this rarely happens) I get angry and sometimes violent. I'll admit I have anger issues but I don't get angry for the slightest things but if someone insults me and tries to hurt me purposefully I sometims start to lose my composure and want to hurt that person. I'm a peaceful man I like to make people happy and I never try to hurt anyone or start anything but I know that in this corld there are bad people who don't care and will try to hurt others. I just want to know how I can stop letting people get to me because as a highly sensitive person I am sensitive to things around me whether it is a sad movie or a bunch of obnoxious jerks I usually take in whatever is around me alot but I don't wish to do so.