This is the opposite of narcissistic. As far as I understand a narcissist would feel like they were the best or better than others in spite of any apparent flaws. You, on the other hand don't feel like you live up to standards at all. You seem to place a great deal of importance on comparisons to others and how you match up to their standards of -- well whatever it is you're comparing.

changing this way of thinking is about acceptance of where you are, and who you are now. It is as simple as knowing there will be people that in certain aspects of their lives, they will be more successful, but there will always be people both more and less successful than you in many ways. Know that even if the people you are with and dealing with at the moment happen to be more successful, more financially stable, smarter or what not, that there are also those less off than you and think on this. Accept this.

There is no real reward to be "better" than anyone else, your status in life really only is something that affects you. Keep in mind those, for me anyway, that I think of as my best friends are not those I think are better off or better than me, but more importantly I feel accepted by them. They are the ones that I feel most accepted and equal to. Do they do some things better than me? sure. Do they have flaws too? of course. But again, more than anything, we accept each other.

This is not an easy place to come to in life. Acceptance of one's self. But it is achievable and something I think would change your life and self tremendously.