Fixing Yourself

I told my son the other day that I was "working on myself" and he said something that really made me start thinking. He said, "Mom, you have been "working on yourself" all my life, you are fine the way you are." I wonder why, after thinking this over, why I constantly feel the compulsion to change. Is this a good thing or a waste of precious time? What about you? I thought I was into self improvement, but I am wondering now if I just can't go ahead and accept myself the way I am, warts and all.