Plagued With Ambition

My wife tells me that most people are blessed with ambition, but I am plagued with it.

I often see things as I think they should or could be and feel the need to  make them that way.  Unfortunately, this often causes me to violate my desire to do one thing and do it well (read focus).
It seems that most leaders have trouble with this.

Why is it that we can’t eliminate world hunger while simultaneously curing AIDS and implementing world peace?   I may never understand the answer to this question, but I know I need to continue to discipline myself to focus if I am ever to achieve anything.