I'm an open water diver, been down to 120ft deep, dove reefs at night, and I've dove into some tight cenotes,..BUT I'm right there with ya @SixPapaCharlie , I don't like large man made underwater structures either!!!
Did a dive off Haifa in 91 to this wreck https://en.wikipedia.org/wiki/Italian_submarine_Scirè_(1938) and at 105' my deepest. Visibility was such a lot of the descent was with neither surface nor bottom in site. I said never again to diving like that but dove the USS Scrimmage in 95 (http://www.navsource.org/archives/11/02297.htm) off Oahu and thought, hmm, warm water, 200' visibility that's what I like.
Haven't done any diving since except in Monterey CA off the beach and those were too cold for me to even want to remember.
We all evolve too - In High school I did a fair amount of spelunking and no zero chance I'll g in a cave.