You are not paid because of how useful you are. You are not paid according to your contribution to society. You're not even actually 'paid' at all. You're simply on one side of a trade.
If you work for an hourly wage, you are not 'earning money'. You are making a trade, time for money, and it's a shit trade, because no matter how rich you ever become you cannot buy more time. Time, when compared to money, has nearly infinite value. Any trade of time for money, is a bad deal. A lot of the time you don't really have a choice, but a shit deal is still a shit deal. Someone else is getting the better end of this equation, and they're able to fleece you like this because they possess more trading and bargaining power than you do.