I just posted in another thread about how my voice is one of my top dysphorias.
I used to always think "I have such a deep voice for a 'girl'..." because the voice in my head was me, and the voice that came out of my mouth, I somehow just didn't "hear" it. I sincerely thought I had a really low voice, and I loved it. It was one of few comforts in that area actually.
Then when I was 22 (8 years ago) I was recording my voicemail message at work. I'd heard my voice recorded before, and I knew it sounded dumb, but I thought that was just what happens when you record your voice, it doesn't sound like it does in real life. I mentioned to my coworker, "don't you hate how your voice sounds so ridiculously high on a recording?" and he was like "uh, it sounds a little different because of the bones in the head [yadda yadda yadda - which I already knew], but the recording DOES sound like everyone else hears your voice". I was dumbfounded... completely and utterly stunned.
Now, I'm a fairly bright guy, and I should've figured that out just by hearing other people's voicemails and realizing that they sound like they normally do, but I just had a complete mental block on that one, so it never occurred to me. I just thought that of course my voice doesn't sound like that, bones-in-the-head aside, my voice is WAY deeper than any recording of it has ever been. Once I realized that I sound like a girl, it became such a huge stumbling block for my confidence. My inner voice actually changed to sound like my external voice, and it drove me crazy. This was long before I finally let myself admit that I'm a guy, and I was right in the thick of "trying really hard to be a girl", and yet even as such, it was like something deep inside me was stolen away and I was left with a gaping maw in its place.
Ever since then I've absolutely hated my voice, because it just doesn't sound like it *should*, and for 8 long excruciating years my internal voice didn't even sound like me. Once I finally came out as trans, I was at last able to get my real internal voice back. The one I'd always heard in my head before that day when I realized what I sounded like to the world. Nowadays, it still really bothers me that my outside voice doesn't sound like my real voice, but at least my internal monologue sounds like me again.