Self-pity, a dominant characteristic of sociopaths, is also the characteristic that differentiates heroic storytelling from psychological rumination. When you talk about your experiences to shed light, you may feel wrenching pain, grief, anger, or shame. Your audience may pity you, but not because you want them to.
Something in the human psyche confuses beauty with the right to be loved. The briefest glance at human folly reveals that good looks and worthiness operate independently. Yet countless socializing forces, from Aunt Clara to the latest perfume ad, reinforce beliefs like 'If I were pretty enough, I would be loved.'
One reason most people never stop thinking is that mental frenzy keeps us from having to see the upsetting aspects of our lives. If I'm constantly brooding about my children or career, I won't notice that I'm lonely. If I grapple continuously with logistical problems, I can avoid contemplating little issues like, say, my own mortality.