Shadix, I understand your thread got a little hijacked, but back to your original question... Even if you don't want to hear this, the only way for you to find happiness or contentment is to stop comparing yourself to others and be satisfied with what you as a person bring to the table. You are right, this is not easy. That's why a lot of us are in therapy. I had to go to a lot of therapy to learn to stop comparing myself to others and be proud of myself for my strengths. I think you need to see your therapist again with the directive that you want to work on this in particular. It's a matter of retraining your brain and thought processes, and it's not impossible at all. Some CBT or DBT could be helpful in retraining your thought processes to value yourself. Perhaps learning to re-parent yourself is in order too, as it sounds like there may be some underlying issues with your family there.

I think you need to make an appointment with your T.

Good luck,
seesaw