Here a neuroscientist discusses how the brain restructures itself when memories are called up:
Neuroscience now knows that every time we rememberWe don't remember what happened, we remember what we want to have happened.
our memories they are "reconsolidated," slyly remade
and reconfigured. The act of remembering requires protein
synthesis because we are literally remaking our past,
altering the cellular connections that define the
original memory trace.
Maybe this is good news. You can have that happy childhood after all.