This might be a gripe that’s specific to me but I find it very taxing. I have a friend and colleague who speaks so quietly she is often inaudible. She’s aware of this because so many people ask her to speak up in different contexts (work, ordering in a restaurant, in shops, social events).
There have now been multiple occasions when I’ve given up on a conversation with her because she is speaking in such hushed tones I can’t follow what she is talking about. This has been when walking on a street or in a cafe so normal settings where there is no need to lower your voice. I can’t be bothered to keep asking her to repeat or crane my neck to try and catch her words. Awkwardly she sometimes starts laughing so she’s obviously (quietly) told a joke and I’ve missed. She also whispers whenever she talks about her husband. 
Can I ask, if you speak quietly and are frequently told to speak up is there a reason you can’t/won’t? I’m genuinely curious because my friend is able to speak in a ‘normal’ tone at times and is a confident person (so this is not to do with shyness) and she doesn’t have a hearing problem/sensitivity she so I don’t get it.