I'd like to add that while I don't think that this condition caused my SA in the first place, now that I think about it, I do believe it exacerbates it. Even at family gatherings where I might possibly be comfortable enough to talk in a group setting, I stay quiet because I simply don't catch on to everything that is being said, and I don't want to sound like an idiot and say something out of context, or be annoying and ask to have things repeated numerous times. I do often feel left out of jokes, because when I miss part of it, asking to have it repeated just isn't the same as hearing it in the moment... and I've stopped trying- if people laugh at a joke that I missed, I just let it go. And the fact that I have to concentrate so hard to have a chance of hearing everything that is said makes it difficult to contribute to the conversation as well... again, I think I've pretty much stopped trying- it takes way too much effort. I don't think it has to do with hearing loss... I hear fine when there is little to no background noise and/or when I'm just talking to one person.
This reminds me of an incident when I was in preschool- I don't remember, but my mom told me about it. They actually had my hearing checked at that age because my teacher thought I might be deaf- I wasn't responding right away when she would call me- like when we (myself and the other kids) were busy playing and carrying on... I was either lost in my own little world, or my ears just didn't filter out or focus on her voice. So I've probably always had this problem.