I have no idea if it is normal or not, but you if you have any issues that might be related to earlier life you might wish to try and write down a timeline of your life. People with early life difficulties apparently report trouble in recollection. Maybe good, maybe bad, but I like to go out and meet my troubles and not wait for them to find me, so I have invested time/effort to recall.

I have found it enlightening how one recollection leads to another until it is surprising how much you eventually come to remember for good or bad.