I'm like that too it's like I can't focus enough to understand, like they're talking another language. It's particularly bad when my anxiety is high. lip reading really helps as well as recording and playing it through headphones and taking notes. It use to stress me very badly. My AP's help I have SzA though. I can respond like I understand but I don't. It's why I gave up on school so many times. I tend to get really quiet when it's bad.