If you work your stuff out on others it means that you let your inner hurts and unresolved issues damage other people. You’ve probably met someone who does this because they walk around treating other people poorly or behaving like petulant children instead of working on becoming healthy and dealing positively with others. The key to being truly happy in life is to work out your inner conflicts and unresolved issues so you can treat people well and not get your stuff on them. As you become healthier you also help create a happier world not only for yourself but also for the people you interact with.
Tips and advice on how to be happy in life by Guy Farmer, How to Be Happy blog.