We fall into two distinct categories:

We normalized so much of what happened as we grew up, that we believe we had a wonderful childhood. Add to that that our subconscious hides hard things, which means many of us have a big gap in childhood memories.

On the other hand, many of us do know that we had it hard, but it has taken real determination to find a way through the pain, and we don't even want to glimpse back at it. We survived, we packed it away, and thank you very much, but no. No digging.