I haven't found a more exact term, and Wikipedia says: "Thalassophobia can include fears of being in deep bodies of water, the vastness of the sea, sea waves, aquatic animals, and great distance from land" so I guess you're covered.

Yeah just a pretty severe case of thalasso. I remember once out with friends I jump off a cliff into the sea then realize it's just me in there and was uneasy until the next guy jumped in with me. Nearly 0 chance of a dangerous shark there but... that feeling.

I thought I was the only one I’ve never been able to swim alone

Seems like it. There's galeophobia as well, which is specifically sharks.You seen to have a very developed case of thalassopbobia, it's just extended beyond the ocean to include other bodies of water.

If you had water in a glass to drink, that would be alright wouldn't it? The fear of something in the water is what differentiates it from aquaphobia.

I think thalassophobia is more the fear of what’s beneath the water. Sharks, weeds, a shipwreck, never ending blackness. It’s all the same amount of terrifying because it’s the unknown that’s the scary part 🤷‍♂️

I just wanted to say really quick, that there are absolutely things that can hurt you in the water in Minecraft! Drowned zombies, drowned zombies with tridents, baby drowned zombies, and those phantoms that spawn when you don't sleep can still hit you when you're in the water! Also, the new textures update makes the deep dark black water in caves look sooo scary to me! So I totally understand how it's scary

It turns into a phobia when it begins to negatively impact your life and ability to adult. I don’t like being in the ocean either it’s a giant toilet, and public pools are smaller chlorinated toilets yuck. But I live on an island and need to take a ferry, and if I couldn’t do that or I had to take sedatives to handle the ride that may cross into a phobia. Does that make sense? It’s the difference between neurosis and mental illness, essentially 

I get the same anxiety/fear in pools, and even worse if others, in it also, are swimming underwater... Just appearing as "dark" because that's how they appear to be in my mind, anyway) masses swimming near/towards me... Alone is pretty bad too, because of the things my mind will conjure up. I've "seen" dark masses near the bottom corner of pools, before, that I was the only person in, because my anxiety had my mind and eyes playing tricks on me... and then I'd feel like I'd see the dark mass getting closer to me, as if something was swimming towards me...smh But I also, definitely, do not have the ability to get into a lake/river or creek!! I've only been in the ocean a few times, during one vacation when I was a teenager... and that's when my fear began. As much as I wanted to love it (I do love the beauty of it, but only if I'm a goooood distance away from the water), being in the water brought me the most overwhelming anxiety and fear... Even just being in the water, up to my ankles, was too much. (Note : I only got in the water more than once because of a family member literally throwing me over their shoulders and "dragging" me in & I was kicking and screaming the whole time) All I could do was think about the enormous and frightening creatures that were also in that SAME humongous body of water, that I was in. Sharks, octopi, and all of those other big and scary things, & who knows how close a shark might be?!?! 😳😫

In my mid-twenties, my best friend and I had the blessing of being stay at home moms (of kiddos who loved playing in water), and the two of us + our kiddos spent almost an entire summer at one of our towns most awesome creek spots and I loved it.... Until one day when someone just had to mention GATOR -GAR🤦‍♀️🤦‍♀️🤦‍♀️. That was, literally, the end of that 😂. I'd probably try to get myself used to being in a pool again, except noooo.... Snakes could end up in a pool. So... Who knows if I'll be able to calm my nerves and enjoy anything beyond an occasional sunbathing session in a kiddie pool, ever again lmao (and I'm 42 years old, btw🤦‍♀️😫). I've not tried anything beyond that in several years. So, you are not alone; for whatever it may be worth.

i think this classifies tbh, i've had a similar experience, though not quite as severe. i can swim alone anywhere if the water is perfectly clear and i can see (and hopefully touch) the bottom, but if i'm in murky or deep water, or the bottom is mushy or things are brushing past me, then my imagination takes over and it's sea monsters everywhere and i have to get out or i'll have a panic attack. doesn't matter who's in there with me

Being afraid of sharks and crocodiles is not irrational.