The majority of your thoughts which bring forth fearful emotion have no valid basis.
Most often, when the emotion is present within you, the thought that is present is pointed toward some unwanted event that you believe is lurking in your future, and once you understand that every future event is of your choosing - for you are attracting those future events with your thoughts - then you will recognize that the fearful emotion is coming forth to guide you away from thoughts of miscreation.
The emotions that you feel, are ALWAYS responding to the PRESENT moment ...