I struggled with a teacher in high school who expected me to write essays with a formula I could never really master, there might have been other things going on but a big one was that I read so much that I had so many examples to work from that her formula didn't make a lot of sense to me.
Even though I struggled to get a "D" in her class I am certainly not a bad writer, I've made a living at times writing, I've written book chapters, blog posts, contracts, standards documents and all sorts of things. I struggled to master the language used in academic writing though.