Our dog, Jack, rarely barks but frequently wags his tail. Like most of us, he has a pretty good life but I'm sure he has a few things he'd like to change.
Do you talk more about your blessings or your burdens? We must see our lives through a godly perspective, not a worldly perspective. The world will make you feel short changed because there will always be more to be had. A godly perspective humbles us and provides for God's will to be done in our lives, more so than our own will.
We would all do well to have more of a grateful heart, than a critical heart. It is not always easy, but finding content in all circumstances is a goal worth aiming for.