Don't be in too much of a rush to shut that little guy up. That little guy can give great advice, though maybe not in words.
According to some metaphysicists, what you are feeling is 'rightness', one aspect of the deeper mind. It is said to originate in the heart, not in the head, as may be decribed as something like the flicker of a candle that alerts you to the fact that something is not right.
It flickers when something is not right and is silent when it is right. If your visual perspective and mechanics are solid, and your mind is clear and focused on an absolute objective, you can become aware of this feeling of being not right when aligning / conceptualizing the shot. If you shift the aim a little left or right, or conceive the speed of the shot as increasing, or some similar adjustment, this slight discomfort or voice fades. It's a little like tuning into a radio station until the crackled noise disappears. When the voice fades, the shot is ready to go.
This does not relate to voices like 'miss this and my mates are going to laugh at me' or similar such voices that come more out of fear and lack of focus.
That said, if problems persist, seek a doctor
Colin