What thing I learned in life is to stay positive though the world around you are grim and screwed up. Never get affected and always seek for the brighter side of anything. Yes, life is too short to be sad. Never dwell in your miseries. Learn to focus your eyes into the small sheen of positivity and not on the mammoth problems shadowing you.
According to one writer, "you find that life is still worthwhile, if you just smile". Exactly. Whenever problems, learn to shrug it off because such as smaller compared to our God who is immensely big. For me, though we are not rich, though we cannot have the luxury of life, yet we are happy and that is consoling. look at some of the rich men, they still live a miserable life since contentment is not in their way. They crave for more and there souls find no satisfaction in every goal achieved.
Thus, in everything that you do, you must remember that LIFE IS TOO SHORT TO BE UNHAPPY. Make the most of it, laugh as much as you can just like this kids, who always look at life as beautiful and joyous as it seems to be.