The problem is your post is a commentary on what you think and feel rather what Romans 6-8 say.
The goal of Christianity is to know God. This is something you could spend ten lifetimes in pursuit of and still have barely scratched the surface of everything there is to know about God.
This is true. However This was also true of the Old Covenant.
If I was to ask you; do you identify as your sinful nature, or do you identify as the good you want to do but struggle with a sinful nature, which would best describe you? Most likely it will be the later of the two. You are the good you want to do but struggle with a sinful nature. Which would align you with what Paul talked about in Rom 7:14-20.
Now say by the power of grey skull, I snap my fingers and suddenly you no longer have a sinful nature. Will you continue to do the evil you do not want to do, or will you only do the good you so desire to do? Obviously, the good you desire to do is all that you are going to do.
Okay then, in your pursuit to stop sinning, what is it you are trying so hard to improve on? The good you already desire to do, or the sinful nature?
The good you desire to do clearly needs no improvement since it already desires to do good. The sinful nature, on the other hand, cannot be improved on. Scripture is vividly clear on this. If it could be improved on, then Paul would not have wrote what he wrote in Rom 7, and the Gospel wouldn't have been necessary.
Before you try and tell me Paul is speaking of before he was saved... this is the real world, not some fantasy. At what point, before you were saved, did you ever struggle between doing the good that God desires you to do and doing evil? The truth is you didn't. You simply did whatever felt good to you in the moment.
Please follow along.
Paul says, the evil that he would not, that he does in verse 7:19. He continues to say in respect to that, he finds a law and that this law is that when he would do good evil is present with him in verse 7:21. Then he says that he delights in the Law of God in his inner man but sees this other Law warring against the Law of God that is in his inner man. And this other law is the Law of sin, that Evil that he would not but does is present with Him even though He would do the Good, the Law that He delights in, the Law of God that is in his members. This is put forward in verse 23. Then in verse 24 he cries out in despair asking, who shall deliver him from this body of death. For the wages of sin is death. In this state he knows his hope and proclaims that through Christ Jesus he thanks God in that he serves the Law of God with His mind, but alas his flesh serves this Law of sin, that law that when he would do good evil is present with Him in his flesh.
Chapter 8 speaks of the deliverance Paul seeks, it says the law of the Spirit of life in Christ Jesus has set us free from this law of sin and the wages of it, death (6:23). For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh, condemned sin in the flesh. Sin is condemned in the flesh that the righteousness of the Law of God that Paul said he delights be fulfilled in us, who walk after the Spirit of Life in Christ Jesus and not after the flesh. (8:2-4) For if we walk after the flesh we shall die. But if we mortify the deeds of the body we shall live. (8:13) And all this is said in respect Romans 6 where it says, shall we continue to sin that grace abounds? God forbid. How shall we who are dead to sin, live any longer therein. Know you not that we who have been baptized, have been baptized into His death. And if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection. Knowing this, that our old man is crucified with him (Hence sin is condemned in the flesh), that the body of sin might be destroyed, that henceforth we should not serve sin. For he that is dead is freed from sin. And if the Son has set us free through the Law of the Spirit of the Life in Christ Jesus, free we are indeed.
Rom 6:1 What shall we say then? Shall we continue in sin, that grace may abound?
Rom 6:2 God forbid. How shall we, that are dead to sin, live any longer therein?
Rom 6:3 Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
Rom 6:4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
Rom 6:5 For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:
Rom 6:6 Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin.
Rom 6:7 For he that is dead is freed from sin.
Rom 7:19 For the good that I would I do not: but the evil which I would not, that I do.
Rom 7:20 Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
Rom 7:21 I find then a law, that, when I would do good, evil is present with me.
Rom 7:22 For I delight in the law of God after the inward man:
Rom 7:23 But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
Rom 7:24 O wretched man that I am! who shall deliver me from the body of this death?
Rom 7:25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
Rom 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Rom 8:4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
Rom 8:5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
Rom 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
Rom 8:7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
Rom 8:8 So then they that are in the flesh cannot please God.
Rom 8:9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
Rom 8:10 And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
Rom 8:11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
Rom 8:12 Therefore, brethren, we are debtors, not to the flesh, to live after the flesh.
Rom 8:13 For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.