When something "has been crushed", it means that it has been damaged or hurt quite a bit.
The word "crush" literally means to squeeze or press something until it breaks into little pieces. For example, "crushed ice" is ice that's been crushed into little pieces.
But "crushed" is also used to talk about an industry, an army, or even someone's dreams. In these cases, it means "destroyed" or "badly damaged":
The American auto industry has been crushed by competition from overseas.
The British forces were nearly crushed, but they managed to hold on until reinforcements arrived.
I don't mean to crush your dreams, but it's extremely hard to get into the film industry. You might want to think of something more practical.