I'm not sure that's the correct diagnosis.

Alternative take: you were not, at that point in your life, equipped to understand that you could be generating new ideas and that you should walk away from that writing course with an appreciation for writing as a vehicle for what you'd like to accomplish with a given subject/format. It's fine that you didn't—many people don't—and your instructors, institution, parents, community, etc. probably could have done a better job at communicating this to you, but it was there, and it was the point all along.