macbeth: Soliloquy

What can I do to stop all this pain? This guilt? Theres no way out now. I just killed my loyal friend duncan just to be king. He didn't deserve this, and i definitely don't deserve to be king.  I figured killing duncan will make me and my lady happy, well I thought wrong. As long as I obeyed my lady and wasn't a coward was all that mattered to me. I can't stop all this killing until I get a crown on my head and no one will get in my way. How will i keep this secret to myself? What if someone suspects me of killing duncan? This is driving me crazy and I'm turning into a mad man!