You're used to this sound because of the "mere-exposure effect," which means we favor things that we're familiar with. When we hear our voices played on a recording, those vibrations are obviously not included, leading us to hear the actual sound of our own voices, which we hear way less often.
It's simple, really: we fear what we do not understand. Just like all those apes in Planet of the Apes.
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Jeremy Glass is a writer for Thrillist and thinks his voice sounds weird pretty much 100% of the time.