For most of my adult life, I've felt that I have a problem with my memory. I cannot recall much of my past life. I can know things happen, and there are a few circumstances that I can recall visually. The visual recollections are retrieved as a series of photos, not like a video.

A few years ago, I discovered that I had a vitamin B12 deficiency. B12 is a contributor to memory, so I was hopeful that by clearing up the deficiency, my memory would improve. I'd have to say I don't think so, but it's a pretty subjective question. At least, I can say it was not dramatic, if improved at all.

Otherwise, I am quite introverted, on the spectrum. I focus on my thoughts much more than what is going on around me, and that strikes me as a more likely cause. The events are not imprinted because I am not paying attention.