Maybe money won't make you happy. Maybe it will. But one thing I guarantee you - worrying about how much money other people make really won't make you happy at all. Unless you are paying them from your own checkbook, their salary really isn't much of your concern. Concentrate on what is one your plate and not your neighbor's, if you really want to find happiness.
NOTE: Some would point out that many people making a lot of money end up paying less in taxes (as a percentage of income) than middle-class people. Mitt Romney pays 15% capital gains tax because he claims his income as a capital gain and not as a salary. Even Billionaires like Warren Buffet think this is scandalous. But raising income tax rates serves only to screw the middle-class and upper-middle-class who actually pay income taxes. The very rich will continue to structure their income as capital gains and pay 15%. (And of course, it goes without saying that Liberals will decry "tax shelters" until they become wealthy, at which point they dive into them). Whether and how this should be fixed is another discussion entirely. While increased capital-gains taxes might affect wealth disparity (as indeed the income tax did when first introduced) it will not eliminate it. And that is why I say it is really a separate issue.