Why do I feel compelled to emotionally torture myself?

I guess it's like emotional cutting? Every so often I need to hurt myself by reliving emotionally hurtful incidents or scaring myself by reading about heart wrenching accounts of aviation disasters or something. Needless to say I feel horrible afterward but I can't stop myself. Anyone else experience this? Is it like because I'm suppressing something or what?
Why do I feel compelled to emotionally torture myself?
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