I would very much doubt that. Joy is in how you engage with the life you have. You can have a Harvard education and (for example) be envious of the guy next door, or let topics-of-the-day drive you crazy (eg: "I don't have kids because it's bad for the environment" or "I never got married, too busy with my career")
And vice a versa, plenty of poor people find a way to be at peace with what they have (and even strive to do better w/o being resentful) , have families, etc.