I Can't Hear My Voice That Well When I Plug My Ears?

Okay, I've posted enough times now to get annoying, sorry about that.

The thing is, when I put my ear on a pillow and I talk, the sound of my own voice isn't as deep or clarified as it used to be?

I asked my boyfriend if he had that also but he said no... I tried looking this stuff up online but no results... my audiogram came back normal twice (I'm within the normal range of hearing), if anything it's that same ear (left) with the muffled-ish hearing when I cover it that has better hearing than my right ear! I'm super confused...

The ENT gave me prednisone because she thinks it can be a form of SSHL but it just doesn't make any sense to me.

Anyone else having this problem? I can hear fine until I plug that ear, all of a sudden it's like the vibrations aren't 100% there and not as loud?