I found I had aphantasia as a flow-on from something else I was investigating.
I have known for a long time that I had trouble watching movies because I lose track of who the characters are. My wife started watching Married at first sight and I got really confused with it. 3 of the ladies had the same shaped face, hair style and colour and I could not tell them apart at all. I searched on Google to find out why and found about Prosopagnosia.
Reading about this it mentioned it was common with aphantasia. I kept reading and it sounded more and more like fiction. This idea that people could see images, make sounds, imagine touch and actually feel it all. I asked my wife if it made sense to her, and she just looked at me like I was mad.
Doing more reading since, I've discovered I have SDAM as well as autism. Sometimes life would be amazing if we got an instruction manual for our minds.