Ill be a good christian boy one day but the other days ill just revert back to my old self.
Romans 7:18-19 For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. For the good that I would I do not: but the evil which I would not, that I do.
Paul had the same problem. He describes it as the battle within us between the spirit and the flesh.
Galatians 5:16-23 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would. But if ye be led of the Spirit, ye are not under the law. Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law.
The process of walking in the Spirit is truth, humility, surrender of self, and constant dependence on God.
You have made a good start seeing what you do in truth. Truth brings humility. When we see that as Paul says, "In us dwells no good thing", we come to humility that is the door through which the grace of God flows (James 4).
Anger, like frustration, disappointment, and surprise is often a result of a conflict between what happens and what we expect. This could be expected. We have been raised in a world controlled by Satan to elevate the selfishness of the flesh. The flesh wants what it wants when it wants it and is angry when it doesn't get it.
The Spirit is humble and grateful. It is by the Spirit that we know that we have nothing that we did not receive. Anger comes from the passion of the flesh denied. Thankfulness comes from the passion of the Spirit guiding us in truth to recognize what little we deserve and how much we have been given. Satan wants us selfish and angry. The Spirit wants us humble and grateful.
Most of us awake to find ourselves entangled with the world like Br'er fox and the tar baby in the uncle Remus story. The way to freedom is not through our own effort. It is our Savior who works in us.
John 8:31-32 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; And ye shall know the truth, and the truth shall make you free.
You need to immerse yourself in Jesus and His word. When you abide in truth, the world and the schemes of Satan can find no hold on you. Truth cannot be selective, like just continually talking about how evil the people are who are outside your church. Truth is most effective when we apply it to ourselves.