In another lifetime I was a middle-school teacher. It only lasted for two years, but at that time I thought it might be my career.
I didn’t wear hearing aids then. Of the many difficulties I faced teaching classes of teenagers, I think some of them did have their root in my hearing loss.
First of all, I couldn’t understand soft-spoken students, and often had to make them repeat themselves. Uncomfortable for me, and also for them, especially if they were shy. The accompanying snickers from the rest of the class were certainly not a positive thing for the class atmosphere or my relationship with them.
I also had trouble when students made low-voiced comments or “talked back” in such a way that everybody could hear but me. It does make it difficult to ensure classroom rules are followed when so much can go on under your threshold of perception.
At the time, I didn’t realise how “bad” my hearing was (I knew I had some hearing loss). I didn’t realise that my colleagues heard that much more, and therefore had more information at hand to help them manage the class. Not hearing well clearly was not my only shortcoming in teaching teenagers, but I probably blamed myself more than I should have for the difficulties rooted in “not hearing things”.