Doesn't others' impression of you square with the facts?

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All of us hope to leave good impression to others in human communication.But it seems that many things in our lives go by contrary.sometimes the impression we leave to others is just contrary to what it actually is.So,why the impression doesn't square with the facts?Perhaps we cover up something intentionally or perhaps we have not found the true innerself. Have you ever been in such situation?if you have,what do you think is the basic cause?