Cleanse yoursef from all guilt, shame and blame. They are toxic and bind us from the true freedoms we should have.
Whatever you do, don't take guilt away from Catholics. It's a very special pleasure.
On a more serious note, here's a few lines from William Blake's Vala, The Four Zoas:
Thou wilt go mad with horror if Thou dost examine thus
Every moment of my secret hours Yea I know
That I have sinned and that my Emanations are become harlots
I am already distracted at their deeds and if I look
Upon them more despair will bring self murder on my soul.