why do people get mad over little stuff?--help

I used to be like you when i was a lot younger. One of things that change me are the books i read. Like Chicken Soup for the Soul. I read stories of people who encounter difficulties in their life and still has the fortitude to maintain a positive outlook. I don't experience what they experience and I have the gall to complain about the little annoyance in my life. It put me to shame. Then I started to change, knowing that you are better off than most people will change your outlook in life. It did mine. I always remind myself that compared to others this little annoyance is a walk in the park.