If you're a self-directed learner passionate about a subject nothing about a classroom holds you back. [1] It sets a minimum pace for acquiring new information, it sets a minimum domain of concepts and to some degree it will influence the order of the first few concepts you'll have to tackle, if you concede to only tackle the subject when the class begins.
I'm endlessly bemused by the repeated assertions of self-identified "passionate", "self-directed" learners that an organized class is some sort of jail cell from which their (self-identified) considerable curiosity and talents cannot break free.
If you are actually passionate, if you are actually self-directed, it may put a crimp in your process for about a week or two until you're so far ahead of the syllabus that keeping up with the topics as-covered in class is no more an obstacle than setting your learning aside to cook or do laundry.
Sure, it can still be an annoying distraction. But it's not a particularly notable one. It's certainly not a pen or a leash.
[1] Slower learners can certainly be harmed by classroom schedules. But one would expect the self-directed and passionate ones would have recognized their predicament long before they entered college and thus realized they need to tackle subjects before they sign up for credit-hours.