I have misophonia and can totally relate to all sounds being "loud", being in the "foreground". The cafeteria at school was awful because I was the only one who couldn't understand what anyone was saying, even though I don't have bad hearing.
I always thought that I had bad hearing, until I took a hearing test which told me that my hearing was above average for my age. Turns out it's just that I have a problem focusing on people's words.