How does someone tell they have psychic power or is it something that comes natural?

The person usually knows something is up or happening. They might not know exactly what they are experiencing but they know it is something.

It would be out of the ordinary – and psychic foresight is knowing what is happening before it happens. So being validated on things you know beforehand is a great way to know you have abilities.

Reference: https://www.quora.com/How-does-someone-tell-they-have-psychic-power-or-is-it-something-that-comes-natural