No man is so completely happy that something somewhere doesn't clash with his condition. Some men are wealthy but are bothered because they don't come from noble families. Others who do hale from nobility lament their own personal poverty. Some who are noble and rich are single and are unhappy about that. Others are married but bereft of children.
Some people have children who commit terrible misdeeds.
Everyone can lament something. Everyone can find something lacking in their lives, if they look hard enough. But it's up to us what perspective we put on our situation. Then you are human. And another truth is relevant.