You're not a failure, you just have chemicals in your brain that are out of whack. Finding something positive about yourself could be as simple as, "I like my eyes" or "My name is pretty". It doesn't have to be a personality trait, although you sound like a warm-hearted person.

This is definitely a disease that gets better with time. We just have to be extremely patient with ourselves and let ourselves heal through therapy. In time, you will easily find things to be positive about. For now, give yourself some credit! This is a tough disorder, and you took the first couple steps, getting to a doctor and a therapist and reaching out on here. That all sounds very positive to me! *hugs*