It is very easy to turn your hobbies or something you love doing into a future career. Many hobbies correspond to real world needs and positions. Consider what you like to do and how that might fit into a career.
Academic subjects translate well into future careers but may require more schooling than other types of careers. Your favorite class in high school could very well launch you into your future career but you have to be willing to work for it.
If you're still confused, consider doing more research on this topic. You can find helpful information by consulting your adviser or college of choice.