This is one that has been getting at me lately and for a while I did not even realize it. Hell, I think it is always getting at me and I almost never realize it.
It really is painful, maybe the only reason we feel pain besides, in someway shape or form running our body's into something harder than us. Nearly every person thinks of themselves as important in some way, I guess it is a normal (don't argue the definition, i don't even know what it means...) course of matters, it is easy to become the epicenter of our own little universe and put ourselves up on a pedestal. Sure there is depression when one may feel worthless, but this is just a converse example: we only feel worthless because we picture ourselves on a pedestal, which doesn't exist, so we aren't on it.

Where I first heard the importance of losing self-importance
My yoga teacher told me to have no expectations. The feeling of self-importance seems to be an ego driven expectation of how others should treat us and what we should be capable of. Which of course leads to a perpetual let down; The feeling of anger because one does not get the treatement he/she deserves; Sorrow because others don't care for us as they "should." And on and on, I am certain I do not grasp all of the ways my ungodly importance affects my life.
Well I guess I am done talking about things I don't understand, and I am going to resume worrying about how I am going to build my self-image tomorrow, feel bad because no one returns my calls, and mope about the standard of living I wish I had. Why ME? Why ME of all people!!