Your brain contains both your dreaming capability and your general cognitive capability and your every day thoughts. Sometimes those different things can cross over and be related to one another.
It is unusual for a 'normal' person to think that characters or 'forces' in their dreams are having an effect on a persons behaviour, hence the seeming puzzled responses you are receiving from people you have talked to about this issue.
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“I was ashamed of myself when I realized life was a costume party and I attended with my real face” - Franz Kafka