I think the main reason is the proximity of your ears to your mouth.
Hearing yourself from inside your head like so many people here have said is a factor but I don’t think it is the primary one.
Try this; Hold a couple of folders or books against your head in front of your ears (to block the path of sound from your mouth to your ears) – then speak.
You will hear your voice after it has been reflected off a wall or something. In doing this you can see that the biggest modifier to how you sound is that your ears are really close to your mouth.
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