Hi Velcro,
Im in the same situation. I have VERY scattered memories until about 8 or 9. 3 or 4 that i can kind of remember before that. My memories after that are still scattered but not so much so. I just attribute it to a bad memory too or maybe I was just in lala land during those years...who knows

. I asked my T if it was abnormal for me not to remember much and she didnt really directly answer the question. She just said everyone is different

and left it at that. I am not really too concerned about it at this point since T doesnt seem to be concerned.
So, with that said, I dont really have answer for you as I am in the same boat. Just know you arent alone.