What kind of opportunity makes you decide what to specialize in and fight for it all your life?

When I was a child, I liked reading books and had a wide range of knowledge, especially about cars. One day in junior high school, the teacher was talking about a topic, about the calculation of cars or something. Later, I stayed away from the history of cars. I responded below and soon found that the whole class cast envious eyes. Since then, I think I should study machinery and vehicles.