Personal experience is not transparent but dependant on so many variables it's not true.
Like family background, personal view of the meaning of life, aims in life, personal way of relating to one's environment, range of knowledge ("how do you know if you're ill-informed?"), etc.etc.etc.etc.etc.
"As within, so without>" (Rilke)
20 witnesses to an accident give 20 different accounts. They were all speaking from their personal experience.