A self-fulfilling prophecy is a belief that comes true because we are acting as if it is already true. New Agers call this The Law of Attraction (see, for example, Rhonda Byrne’s 2006 self-help book The Secret), but there’s really nothing mystical about it. Our expectation that we will see a particular outcome changes our behavior, which shapes the way others see us. In turn, others provide the feedback we’ve set ourselves up to get, which serves to reinforce the original belief.
Let’s say, for example, that I’m going to a party where I don’t know many people. If I believe I don’t make a good first impression, or I worry that nobody will talk to me, I will probably enter the party acting awkward, anxious, and standoffish. In turn, people are likely to interact with me with less enthusiasm, or they may ignore or shun me. Which only reinforces my belief that I’m not good with people I don’t know.