Godly Sorrow vs Worldly Sorrow

Godly sorrow brings repentance that leads to salvation and leaves no regret, but worldly sorrow brings death. (2 Corinthians 7:10 NIV)

Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. And he cast down the pieces of silver in the temple, and departed, and went and hanged himself. (Matthew 27:3-5 KJV)

Why is the sorrow of Judas a worldly sorrow? Because he focused on himself. "I have sinned ... I have betrayed ..." There is no God in his sorrow.

Why have you despised the word of the LORD, to do what is evil in his sight? You have struck down Uriah the Hittite with the sword and have taken his wife to be your wife and have killed him with the sword of the Ammonites. (2 Samuel 12:9 ESV)
David said to Nathan, "I have sinned against the LORD." And Nathan said to David, "The LORD also has put away your sin; you shall not die. (2 Samuel 12:13 ESV)

Why is the sorrow of David a godly sorrow? Because he focused on God. "I have sinned against the LORD."