How can you tell if you are psychic?

There is no definitive proof that psychics exist. All indications tend to debunk the idea.

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I suppose the question is whether you are looking for a scientific answer or otherwise.

Many things that appear to be psychic powers are actually using a combination of very astute observations of human nature, as well as choosing very generic questions and answers.

One of my psychology instructors, Ray Hyman, was an excellent magician. He and other psychologists like him were able to find alternative non psychic explanations for essentially all "psychic phenomenon" that they were presented with. Apparently he even made Wikipedia.