Not completely true.. you can find lots of people who want to pay you to do things to help them out... ask old lady's on your street if you can shovel their drive way in the winter, take out their garbage. Ask your neighbor, and friends who are adults if you can help them out around the house, at their job if they're self-employed. A lot of people will give you a few bucks for helping out or help you out in other ways.
Don't say "can I do anything to make money" most adults are really turned-off by that and will think you are greedy and selfish. start by offering to help out around your house and neighborhood and when you know your good at stuff offer to help out or to learn.
Lots of people get rich before they ever get an education, if they know the right people or have good enough ideas! Develop your skills as a musician, artist, and helper-outer and make some friends! Who knows, they might be rich!