Doing what you love may well be good for your career. However, that doesn't mean the thing you love will BE your career. You could spend your teen years pursuing your passion of music for example. Maybe it leads you to think about how the brain responds to music. Maybe from there, that ends up turning you on to neuroscience. Maybe from there, you end up in a career as a brain surgeon. It happens.

So chasing your passion can lead you to a very good place in the world so long as your keeping your eyes and mind open while doing so. Pursuing or NOT pursuing your dreams with a closed mind will probably not get you far regardless.