Sadly I think its just human nature to compare stuff! I used to do this too but then I stop and look at my life and the things I have and I tell myself, "well so what? I may not have a lot of money or nice cars or a big house, but I have something a lot of peopl don't and that is self-respect and self-esteem!" If you're happy with yourself then its easier to not look at the negatives like this.

I know this probably doesn't help you at all but its helped me sometimes. Just make a list of ALL the good things in your life! As long as you are happy and appreciate what you have, you won't feel the need to compare yourself to others as much anymore!