Why am I always thirsty?

I’m wondering if anyone else has this problem or if they could offer some insight into it.

I am like a fish. I consume water at such a frequent rate, it’s unbelievable. There are days where I go through 2 2-liters of water.
I often wake up 2-3 times at night just so I can get something to drink because I’m so thirsty and I almost always has cottonmouth.

I know this is a common symptom of diabetes but I’ve been tested by three different doctors for it and nothing. There are also only one known cases in my family of diabetes and that is in a great uncle.

I’m starting to wonder if I just part fish or something lol

Could I just be unusually thirsty or is there something else I haven’t looked at?

Besides the extreme thirst there isn’t really anything that is noticeably out of the ordinary.

Thanks for your help!
Would sodium effect my water intake that much?
No medication except for an inhaler which I’ve been on my entire life and has never caused problems.

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