How do you overcome fear?

I have differing levels of fear about a wide variety of things in my life.  It is said that fear is a lack of faith in Christ.  Yet I feel that my faith in Christ is very strong.  Yet I still have fear and worry.  I don't think it is a lack of faith in Christ, I think it is a natural human trait.  The trick is to not let it rule your life.  If you let it rule your life, THEN it would be a lack of faith in Christ.