So what can we do to work with our shadow self and harness that side of us that is nasty and dark? Turn it into something tangible like art or change that energy and thought. I tell people all the time that the jewelry I create, the aggressive talons, the large and possessed pieces reflect the badass part of me - the side of me that is unhindered.
I once read the performer and singer, Marilyn Manson say that his music channeled his aggression and violent thoughts however it didn't mean he went out and tried to do any violence to others. And I felt that it resonates so much with why it is so important to release certain energies and thoughts into good action.
thus - make art, dig in the dirt, go for a thrill seeking bike ride through your neighborhood, go to a ropes course with a friend, do some yoga, meditate, climb a tree, go swimming in the ocean - physical movement or activity stimulates some of the same chemicals in our brains as those found in certain drugs.
I hope this gave you some insight and thoughts about the shadow self and learning from all the aspects of yourself. The good and the bad.