Is it hard for anyone else to determine what’s real and what’s not?

Like am I the only one who can’t determine if some of my memories are real or if they’re fake from a dream or something?
They all seem real but if I ever bring them up or try to verify them with people who were in them they never actually happened.
They’re like fragments of memories that I’m certain have happened but apparently not. Does anyone else experience this?
Is it hard for anyone else to determine what’s real and what’s not?
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