Maybe you have aphantasia as well. I had without knowing it.

Some observations:

Someone told me to close my eyes and think about "an apple at a table".

Then I was told to open my eyes and tell what color the apple was.

The question didn't make sense to me:

I only thought about about the concept of "an apple on a table". When my eyes are closed it is black. Absolutely black. Blacker than a Norwegian winter night with cloud cover and no moon. There is nothing.

Until then I thought all this talk about seing things was just a metaphor for what I had also done.

But when I talk to others they will often immediately say it was green or red. Because they saw it.

Two extra observations:

Sometimes just before I fall asleep I can sometimes think images of stuff that doesn't exist: think 3d modeling with simple shapes.

And just after waking up I can sometimes manage to see relatively detailed images of actual physical things.

Both these only last for a few seconds to a few minutes.

Does this help?