Replying to Becoming More Aggressive

To give you a little background, im 17 and a senior in high school.

In the past week or two ive almost gotten in 3 different fights for completely different and bull shit reasons. But in the normal shit that goes on before a fight, i dont feel how i should to be able to really fight a good fight. Sounds wicked stupid i know, but i cant seem to get mad. My dad for example and a lot of my friends have really bad tempers and get mad really easily which results in breaking things (in my dads case) and fighting (in my friends' case.) Its really getting annoying to me how i feel like i have a lack of anger out of all my emotions. Basically what im trying to say is im pretty much a pussy when it comes to fighting. I hate fighting and im just a really chill kid, but sometimes you have to fight just to defend yourself or whatever. So what im asking here is if anyone knows how to get mad on command. Not just act mad and act tough, but actually get legitimately mad. I have no temper and some might think its a good thing, but it can be really hindering in some situations. Anyone?