BLAME

Taking personal responsibility means that you keep blame in perspective.  You certainly don't blame external things for what has gone wrong in your life, but you also lay off the self-blame.

It's much more productive to learn from an experience, especially the ones that didn't turn out the way you wanted them to.  Blaming yourself oftentimes leaves you stuck at a pity party, and when self-blame is taken to extremes leaves you positively paralyzed.