Has this aversion to produce from the watery depths been lifelong? I think we should be told ... 
<inserts that popcorn emoticon, if he could find it... >
Yep - I am not a fickle creature - I have always detested fish

They are :-
smelly
slimey
got bones in em
have big bug eyes
scaley
did I say smelly
As for things like muscles , oysters, et al - they are just plain wrong - who thought eating mucus would ever be a good idea

Squid / Octopus etc - all rate on the bizarre reichter scale of food groups - why not just eat tyres

Prawns etc - you have to rip out the black thread vein before cooking and we all know what that is

Crabs / lobsters etc - the sound when you have to rip that shell open is horrible and the pinchers and things just plain scary

I hope that about covers it ...