How can I accurately explain the absence of something?

How can I get the idea of something being innately missing to people that have had that something from birth?

I suppose if I use a metaphor, I can approach my frustrations: blind people are often asked if they 'see black'. No they fucking don't - they see nothing. Their brain doesn't process (if they are truly blind from birth) a single iota of visual information. That entire sense is absent. Unavailable. Most sighted people can accept, though never truly comprehend (for obvious reasons) this phenomenon.

In a similar manner, I am not a story teller.

I cannot create stories.

I cannot propel my characters into the unknown, barrage them with hardships, events, plot twists, failed romances, miracles, filler episodes or grand finales.

It's frustrating, yes. It gives me its own set of hardships, because as an artist, you're fucking useless if you can't tell stories, as then model sheets become pretty much the only thing you can do well. But the most exasperating part of this lot is that I absolutely fail to explain even a fraction of it to my fellow artists - the lucky bastards that tell stories with ease. :b I'm the blindness to their sight - and very much in the same boat as people that suffer from medical conditions that are sometimes thought to be non-existent. My frustration is very real to me, but others are incapable of even beginning to imagine what it's like to be in my place, which, of course, translates to "it's not real" in their heads.

I often hear "Well, how come you don't just make your character do X?". Those suggestions always stop me in my tracks, because yes, they are all incredibly brilliant, yet incredibly simple… but I don't see it for myself. Never! It is only after they share an idea they came up with in one second (!) that I'm left there standing, gaping, like Dr. Watson to their Holmes, awestruck at how simple the chain of deductions is and how elegant and correct the observations are.

This storytelling infertility would be much easier to explain to others if it was accompanied by a physical abnormality, like a missing limb. Then I could just point to the empty air where it ought to be and say, "Look. SEE?! You have this... thing, but I do not. AND YOU'RE ASKING ME TO DO THE EQUIVALENT OF CARTWHEELS TO A QUADRIPLEGIC!"