Psalm 13
David is in trouble again. In this psalm we see how he is feeling and how he responds.. It starts with David feeling as if the Lord has forgotten him, and is paying him no attention. He is wrestling with all sorts of troubling thoughts, probably imagining all that could go wrong. Sorrow fills his heart and it seems as if the enemy is triumphing over him. He does not want the enemy to be able to gloat in triumph over him. His response is to call on the Lord, he still trusts in God and reminds himself that God has been good to him.
We can feel guilty when we experience difficult and negative thoughts and feelings, this is normal, and we see how David responds to the situation.