I almost drowned in Lake Erie when I was 5 and I (somewhat ironically) love the ocean. So guess i'm a special case or something.
Situations like that affect different people in different ways. You can have a 'traumatic' experience and not be traumatised by it. Car crashes for example, I've had one (I was the driver lol) and it didn't stop me from driving when I got a new car.
Close family deaths for me. That being said they are inevitable, so nothing I can do. Aside from that I don't really have any other fears. Well that or a brain aneurysm.