I have a hearing disability, as in it's been identified by doctors.It sucks because you can see the other people having a conversation without a problem. Also, if the other people my table are having 2 conversations between the 4 of them it's even harder to follow.
When looking this up on Google I've seen it called "The Cocktail Party Effect" or the uncanny ability for people to selectively hear speakers in noisy crowds. My ability at this is a fail.
I was born with it, my left ear has only about 50% hearing and it's kind of tone deaf, like how things sound when you're under water. But most people who meet me don't know and don't guess until I tell them, because I can hold a conversation just fine.
But if I need to triangulate where a sound comes from, I'm screwed. If I need to pick a sound out from other noises, I have difficulty.
If I am walking on a noisy street talking to someone, I just instinctively stand with my good ear closer to them.