Dear Grazer, anger and any amount of character traits we have are normally tied to our past in one way or another. When we become born of God, old things pass away but we must count it so. In Romans Chapter Seven Paul confronts a battle within as to a battle with the flesh.
NIV Romans 7:16 And if I do what I do not want to do, I agree that the law is good.
NIV Romans 7:19 For what I do is not the good I want to do; no, the evil I do not want to do-- this I keep on doing.
NIV Romans 7:21 So I find this law at work: When I want to do good, evil is right there with me.
NIV Romans 7:24 What a wretched man I am! Who will rescue me from this body of death?
Well you can read it for yourself, but looking at everything he went through, in NIV Romans 8:1 Paul says, "Therefore, there is now no condemnation for those who are in Christ Jesus.
Lack of faith in what God promises us causes many Christians to never leave the past behind and go forth with God. If King David did that he would still be wallowing in self pity. He was the cause of Bathsheba's infidelity, the death of her husband and there remained no joy in the salvation he knew he possessed. He had to overcome that to become the man God said was a man after His own heart.
1 John 1:9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
David said it like this in Psalms 103:12 As far as the east is from the west, so far hath he removed our transgressions from us.
So with Paul in Philippians 3:13, he too can forget those things which are behind, and reaching forth unto those things which are before.
Isaiah 43:25. I, even I, am he that blotteth out thy transgressions for mine own sake, and will not remember thy sins. If God doesn't remember our sins for His sake why are we crying in our beer? You might just list the things that anger you and work at that part of your life for now. When you have patience for that, something else will pop up to take its place. You must remember that in Philippians 2:13 that it is God working in you to will, and to do of His good pleasure, and He ain't done with you yet.