My biggest fear is living in a theocracy. Part of what's wrong with america today.
As for the rest: I'd have no problem being buried. In fact, I'd like my coffin filled with peat and fine-grained anoxic sediment so my ass could be fossilized.
Heights, no problem.
Flying..I love flying.
Spiders and bugs...that's a sticking point. I know in all reality they pose little to no threat, but they still make my skin crawl. I'll tolerate them outdoors but if they come inside they have to die.
No real fear of deep water, either.