Seeds of self doubt

How often do we let the seeds of self doubt keep us from reaching our fullest potential?  I read a quote today that talked about how intelligent people are held back by fear and doubt.  I know that as a creative soul, and as a sensitive soul, doubt and over thinking are the two greatest impediments to my reaching for the stars. 

I vow, from this day forward, to consciously be aware of these self doubts and these internal fears, and recognize that they are simply manifestations of my own mind.