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The pressure on my head hurts at the bottom of a 10 ft pool. I don't know how divers do it...

You have to equalize your ears and sinuses. You're feeling pain because airspaces are getting crushed without equalizing pressure.

by pinching your nose and blowing you can equalize the pressure in your ears.[1]

https://en.wikipedia.org/wiki/Valsalva_maneuver

I'm not sure if this is normal but I have voluntary control over my eustachian tubes. Opening them makes a small click that's audible to others if they put their ears up against mine :)

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