Go outside and throw a tantrum. Stomp the ground, scream and yell, roll around. And when you start to feel like a moron because you're acting like a child, you'll realize that being angry over little things is the same thing. It's childish and a waste of precious time. That's something that's always helped me straighten up and act like an adult. It'll make you realize that when you get angry and hit things or just act afool in general ,people see you like a child throwing a tantrum and nothing more.