@chai2,
Yup, I've been in and around plenty of deep water, and I'm planning to move back to the sea in a few years. I've been in water where great whites are rarely seen and wouldn't you know it...
Although I live on the prairies and I rationally know that sharks can't get at me - even when swimming in fresh water and something errant touches my foot. I also live a virtually snake free place, doesn't matter, I still recoil in fear. I've seen some really bad buggers in the wild, hidden and waiting. I realize they are probably more scared of me but... I also realize that most fears are irrational and therefore, I own my stupidity. But, when i'm sleeping and a shark comes into view, I can't for the life of me convince my unconscious self that I live on flat land.
On the other hand, I have absolutely no problem speaking, performing or making an ass of myself in public.