I'm a chronic mumbler -- I try not to be, but when I speak, it feels very loud (to me), but comes out quiet and mumbly; when I speak up so friends can hear, it

I'm a chronic mumbler -- I try not to be, but when I speak, it feels very loud (to me), but comes out quiet and mumbly; when I speak up so friends can hear, it feels like I am yelling. Definitely not about compression, though.