If you give it away freely, you don't ever have to worry about the measurement. The world will reward you 10 times over. Think about your mood. If it's more than five minutes, something's wrong. And your attitude, relationships, results and success will suffer.
Many people become bitter because of their jealousy or envy of other people or their own misfortune.
List the lessons you can learn from those you have bitterness for and the results will turn your thinking towards your own success and away from theirs. Celebrate victory and defeat. In my early days of selling I would go buy myself something every time I made a sale. When someone told me to celebrate victory and defeat, I started to buy myself something after I lost a sale, too. I felt great.