The good guy is you, FYI. This is a duel to the death between your inner self and this intruder, this outlaw, who is trying to under-mine the person you want to be. Either you face your issues and come out victorious, or you run away and hide.
Whatever shame or guilt you carry, however deep the regrets in your life, no matter what you have done, there is a mercy that is deeper yet. “With you there is forgiveness,” said the psalmist.