That's true, we don't use all the stuff we learn in school. When I was at school, I wanted to be a writer, and it was pretty frustrating having to sit through Algebra II and Pre-calculus in high school...
Little did I know that years later, I'd be interested in learning computer programming, and actually those maths classes kind of came in handy...
I do think students should be taking classes they connect with as early as possible. But there's also a strong argument for learning as many skills as possible while you're at school. The reality of the real world means that very few people end up doing exactly what they want to do, and having a broader skill set will help you overcome many obstacles.
Also, it's very important to remember that sometimes its the journey rather than the end product that matter.
I did a module on Elizabethan literature at university - knowledge which I don't think I've ever used again since.
Nevertheless, the endurance and skill required to research and piece together 5000 word essays on subjects like The Faery Queene probably helped me become more organized, a better writer, a better navigator of Wikipedia... Etc etc