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We all have different bodies and brains. Differences in vocal cords, tongue, teeth, and lungs can affect speech, but the brain is the main part. The brain is why lots of people can do foreign accents or impressions but still have a natural speaking pattern separate from those. We pick up our unique way of speaking as children as we learn to talk. Baby babble mostly sounds the same, but by the time kids speak in full sentences they have a much more individual voice. As they grow, kids pick up expressions, vocabulary, and vocal quirks that further separates each kid from their peers.

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So, the reason of our voices being different than each other is we actually choose our voices.

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That would be a stretch. It's more nature and nurture. Your physical characteristics will impact tonality and what not. You're upbringing will impact cadence, pronouncation, and other influences. Finally, your brain will make its own choices combining all this input into your own voice.

You can consciously influence some parts like pronouncation and accent if you work at it.

well that and the structure of your respiratory system and shape of your nose and mouth. The slight differences in skeletal structure changes the length, width, diameter, etc. of muscles and tissues that are responsible for speech, making each person have a unique sound

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It's a fun party trick, makes you absolutely baller at running tabletop rpgs too.

Frankly I'm looking forward to doing this when I've voice trained enough lol

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I'm sure we do make many choices, some of them quite consciously, that affect the way we speak.

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Also,

We have different everything. Voices (like faces) are noticeable because we use them as a primary means for communication within our group, and our brains have evolved to zone in on the differences nonchalantly because it was a matter of life and death back then. Nothing about two people is exactly the same, things may be very similar. Most of these things go unnoticed, since they didn’t play as significant a role in our evolutionary history.

I imagine a dog asking on doggedit: “why do humans all have different smell?”

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