What you describe is not stifled creativity but a hurt self-esteem.
There are lots of people in the world smarter then you (and me). This might be humbling, but this can also be used to your advantage.
Instead of being sad about someone having had already invented what you thought about, build upon it! It's magic: you just thought about it, and it already exists, often ready to be used. Use it and build the next level. Pick the ready-made wheels, steel beams, a motor, and build something new, say, a car.
There are lots of people in the world smarter then you (and me). This might be humbling, but this can also be used to your advantage.
Instead of being sad about someone having had already invented what you thought about, build upon it! It's magic: you just thought about it, and it already exists, often ready to be used. Use it and build the next level. Pick the ready-made wheels, steel beams, a motor, and build something new, say, a car.