Everyone in life has a different motive for being happy, but a common trend exists this will help to exploit this common trend and make your life filled with joy.
Eliminate all preconceived notions about people, these are all judgements, think about their real actions. This makes a big difference, now you realize that these were all your interpretation of their actions.
Step2
Learn to forgive others for their mistakes, and try to think the best of people. This may be a very hard step for most people.
Step3
Learn to appreciate what you've got, it's always good, no matter what financial position you are in you can find a way to enjoy your life.
Step4
Find an activity in life that makes it worth living. For example a job, hobby, kids, etc.
Tips & Warnings
Life is not worth being wasted in hatred
Smile, it reassures everyone and it makes you feel better