This could be from any age really. I remember reading lots of books like Harry Potter as a 4th grader to seem smart to the teachers looking at me but I didn’t understand any of it. When the big YA dystopian boom was happening, I read tons of terrible YA dystopias to seem cool but many of them frustrated me.
I was never any good at reading at school, nor could I spell for toffee, much less understand punctuation. I hated school and education; it was a miserable place for me. I taught myself to read and write when I left and had full control over my own education. Nobody would guess this nowadays; I can read anything and absolutely love it. But, I have never impressed anyone when it came to reading.
I’ve always felt the same way as you to be honest. In fact part of why I got into reading was that I started writing short stories outside of the education system. Then, when I read books outside of school, it felt far more freeing.