I've really enjoyed reading this thread, because I also have a lot of trouble wrapping my brain around the idea of a 24/7 D/s relationship.

I just tell myself that everyone is different, what works for other people can scare the shit out of me, and what I like would probably really creep out most of my friends.

I think if you can't grasp the appeal of a certain lifestyle/kink/variant thereof, then no matter how many people try to logically explain it to you, it's not really going to help. If you don't get it or like it, other people telling you that it's okay for them won't help you much. Understanding something intellectually really does not make it easier to really 'get'.

So my advice is to not worry about not being 'submissive enough', and just accept that some people think about things very diferently from you (or I, for that matter ).

That's my two cents, hopefully I said something useful.