My biggest fear.... I'm scared of a lot of things (spiders, places full of people etc)

But my biggest fear is being trapped somewhere where I can't breathe. Such as being buried alive (I know that'll never happen but when It happens in dreams I can't function for like 20minutes after waking up) or deep water. I have a fear of going into the sea past where my feet touch the floor and the water isn't up to my neck. I don't mind swimming pools because I know there's walls and stuff to be able to help me up, and there's a lifeguard (again, I know there's a lifeguard at the sea but the sea is so huge it would be difficult to see every person) but the sea scares me because I don't trust currents/animals to not pull me under.

So yeah, my biggest fear is being trapped somewhere where I can't breathe.