I don't know if I said this here or on another post, but this is my huge denial issue. While others seem to have huge blank spots in their past, I don't. I have RECENT blank spots, and RECENTLY, my memory has been aweful, but I just don't see any lost years or anything when I map out my life. Instead, my family is always astounded by what I DO remember, like, I can remember almost all the phone numbers of all the places we lived, right from age 5. Not to mention my strange ability to remember some therapy sessions almost verbatim.
I have this problem too. For me, I didn't even realize how much I DIDN'T remember until T would ask me for specific examples from ANY time in my childhood to support my generalizations about my past and I could not give him a single one. Or, that I was told I witnessed (bad) things that I should remember, but don't. Or that if I go intellectually through the timeline of very significant events that I know happened from an informational perspective, I realize I don't actually have any memory of them. Like, my dad was in and out of the house (significant breakups between him and my mom) at least four or five times between birth and nine, when he left for good...but I always just say, "My dad left at the end of third grade." Or, that my older sisters moved out to stay with their dad after said bad thing I witnessed, and I remember driving to pick them up for visits, but I didn't actually remember that there was a period of time where they didn't share the room with me. Until T dug a little bit with me, I outright complained to him that I hadn't forgotten anything and I had an excellent memory of our past. Before my parts started acting up during therapy, I could remember whole sessions almost verbatim as well. Same thing with addresses and phone numbers from my childhood, but we didn't move very much. I've had a few memories coming up, though, that definitely were dissociated (when I can give the benefit of the doubt to the little ones that they are true) and TONS of feelings about things I knew happened objectively, but thought I was numb and apathetic about. So, it's becoming obvious to me that I don't remember those early years nearly as well as I thought I did...
I don't know if that helps with the denial stuff at all and I'm not saying your experience is the same either. But, I don't think most people feel like they dropped out of the sky at nine-years-old with no history. I think most everyone has a general sense of having existed within a certain a certain environment and it isn't until you go looking for specific stuff that you realize the emptiness that is there. I could be wrong, but I think most peoples' brains would kind of create a sort of context to their lives, even if it is only pieced together from information that others have given. Like, I have memories that are made from photos of my childhood or stories that my older siblings or extended family have told about me. When I try to sort out whether I actually remember those things happening, I don't...I just remember the story being told over and over and made it my own.