One of the hardest things to do in life is to give away what you have a lack of. This law is an unwritten and pretty much unpopular law with the way that society works today, but it is truly a law that works. If you find yourself lacking in joy, and lacking in happiness, do your best to make someone else happy. Help someone do something that they would have otherwise never done without your help, smile and be kind to someone who is being rude to you, and try your best to bless others in any other way that you can think of.
There is a wonderful mythical law of nature that the three things we crave most in life: happiness, freedom, and peace of mind, are always attained by giving them to someone else.