I pray everyday for God to forgive my sins. Sometimes I get angry, say words that hurt and need the Lord to forgive me. This does not impugn me from asking forgiveness from the one I wronged - I absolutely have to ask their forgiveness, but I have the blessed assurance that if I humble myself before the Lord, He is faithful to forgive.
Don't let anyone tell you different. God's word is immutable and He cannot lie. His word states that if we ask for forgiveness, He will grant it. 'Nuff said.