Great stuff! Great! However, the issue is not, and has likely never been, that young people aren't willing to believe "they can do that". It's that most people, of necessity, are not good at both inventing, manufacturing (how to efficiently make that invention many times), and sales (how to get someone to buy it). Therefore, they will need to find someone willing to hire them to do one part of that process. And the modern labor market is not interested in training people on the job, they want someone who's already done the job somewhere else.

Not saying you shouldn't go tell kids about how things work! Just that the reason kids don't do that as much, is not primarily anything to do with education or the kids, but rather because the modern labor market has done its best to avoid ever having to give anybody a chance to do something they haven't already done many times before.