When Jesus says you are forgiven, you are forgiven! The fear of disappointing God resides in the fear that God hasn't or won't forgive you. Perhaps you have played fast and loose with sin and abused grace. That is not good. It is unwise. It will give the devil a field day for condemning you and accusing you.
Don't confuse your own guilt and feelings of condemnation with God's failure to forgive. Listen to Jesus' words to this fellow who apparently was so consumed with guilt that he was literally paralyzed. The Master looked at him and said with authority, "Take heart, son, your sins are forgiven." And then to demonstrate His power to forgive AND to prove that He had forgiven He then healed the man!
If you fear that you have disappointed God and He won't forgive you, consider this sampling of His promises throughout the Word of God:
“Take courage, son; your sins are forgiven.” Matthew 9:2
“He who believes in Him is not condemned.” John 3:18
“We are delivered from the power of darkness and conveyed into the kingdom of the Son He loves.” Colossians 1:13
“When you were dead in your sins and in the uncircumcision of your sinful nature, God made you alive with Christ. He forgave us all our sins, having canceled the written code, with its regulations, that was against us and that stood opposed to us; he took it away, nailing it to the cross.” Colossians 2:13-14
“These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life” I John 5:13
“If our heart condemns us, God is greater than our heart, and knows all things.” I John 3:20
“If we confess our sins to Him, He is faithful and just to forgive us our sins and to cleanse us from all wickedness.” I John 1:9
"as far as the east is from the west, so far has he removed our transgressions from us." Psalm 103:12
“I, even I, am he who blots out your transgressions, for my own sake, and remembers your sins no more." Isaiah 43:12
"For I will forgive their wickedness and will remember their sins no more.” Hebrews 8:12
"Then he adds: “Their sins and lawless acts I will remember no more.” Hebrews 10:17
"Therefore, there is now no condemnation for those who are in Christ Jesus, because through Christ Jesus the law of the Spirit who gives life has set you free from the law of sin and death." Romans 8:1-2
Never sell God's grace short nor the power of His forgiveness! He has given you faithful, fearless friends to help you deal with your fear of disappointing God. AND, He has assured you of His amazing grace that forgives you of your sins and lifts the weight of guilt from your conscience!
Could this be what John meant when he wrote, "Perfect love casts out fear"?