No offense intended, but I've always bristled when people imply I have a low self worth. I have low self-efficacy (the belief that one is capable of performing in a certain manner to attain certain goals) and I'm ashamed of some of the things I've done or haven't done, but I've always felt valued, even if only by my parents at times and not by siblings or friends.

It might be worth looking at improving the self-efficacy. I have some idea of how it got that way, but I'm ashamed of it as well. I'm a very intelligent and intellectual person and the fact that I can just think my way past my automatic irrational thoughts and achieve the goals I would be capable otherwise irritates me. Except the thoughts so firmly entrenched that they're at the core belief level.