Look in the mirror. Make a fist and a frowning face. Jump up and down and yell. You will begin to get angry.
Now start to smile slowly aiming toward laughing out loud. Because it takes twice as many muscles in the face to smile rather then frown, it is actually easier to smile. Each muscle does not have to work as hard and all work together more easily. Now think of something that makes you happy. Use your imagination and visualize. Look into the mirror and watch happiness well up in you as easily as it does in a child with a lollypop.
An amused attitude toward life can get you through some difficult and ridiculous situations. Try laughing out loud next time one comes.
A hundred years from now it will not make any difference.