Yes, I have often felt like this.....and it's made me feel so guilty! I think we all have felt this way at one time or another. I don't think God is angered by it. He just wants us to be honest and talk to Him from our hearts. If we can't find the words to express our feelings at the time He understands. This article has helped me:
http://www.joemckeever.com/mt/archives/001044.html.