As pointed out in a post that was written subsequent to your post, Paul is using the "I" to denote all of Israel living under Torah - he is not speaking of himself literally. He is making a broad generalization about what happens when the Jews received Torah - the Torah brought nothing but death and judgement to them.
Your reading your view into the text , if Paul is not speaking of himself then how is he separate from "all of Israel" s seeing as he is a Jew ? no your argument doesn't carry .
We have no reason to suppose Paul is not speaking personally , at every point he DOES speak personally , especially when summing up his agony , "O wretched man that I am! who shall deliver me from the body of this death"? hardly the cry of Israel as a whole !!
But all such things aside, we know that Romans 7 cannot describe the state of the Christian for the simple fact that there is no possible way the following statement Paul makes in Romans 7 can be true of the Christian:
For I have the desire to do what is good, but I cannot carry it out
This is the condition one finds themselves in after being defeated momentarily by sin , a theme all Christians , apart from you it seems , would easily recognise.
This simply cannot be true for the Christian in any state. If a person is a Christian, they have the Spirit - this is Paul's argument in Romans 8. And this gives the Christian the capability to do right.
Not always , the Christian experience is NOT either Romans 7 or 8 , it is largely both!
There is no way that a Christian cannot do what is good. And yet that is precisely what Paul says of the person he describes in Romans 7.
sure there is , there are many ways a Christian cannot do good , one way would be to be unwatchful , another would be to lack praying , another would be to give in to the deeds of the flesh through temptation ....... as with all doctrine there needs to be a balance here , let me illustrate what I mean by balance by quoting A W Pink ;
The Great Change
Not that the minister of the Gospel must swing to the opposite extreme and teach, or even convey the impression, that the Christian can expect nothing better than a life of defeat while he be left in this scene; that his foes - both internal and external - are far too mighty for him to successfully cope with. God does not leave His dear child to cope with those foes in his own power, but strengthens him with might, by His Spirit, in the inner man; yet, he is required to be constantly on his guard, lest he grieve the Spirit and give occasion for Him to suspend His operations. God tells the saint, My grace is sufficient for thee (2 Corinthians 12:9), but that grace must be sought (Hebrews 4:16) and used (Luke 8:18); and, if it be sought humbly and used aright, then He giveth more grace (James 4:6), so that he is enabled to fight the good fight of faith. Satan is, indeed, mighty, but there is one yet mightier: Greater is He that is in you, than he that is in the world (1 John 4:4); and, therefore, is the Christian called upon to be strong in the Lord, and in the power of His might (Ephesians 6:10); and though, while severed from Christ, he can produce no fruit (John 15:5), yet, strengthened by Christ, he can do all things (Philippians 4:13). Christians are overcomers (1 John 2:13; 5:4; Revelation 2:7).
Thus, we see, once more, that there is a balance to be preserved: Avoiding, at one extreme, the error of sinless perfectionism and, at the other, that of spiritual defeatism. Truth is to be presented in its scriptural proportions, and not dwelt unduly on either its gloomy or its bright side. When one is regenerated, he is effectually called out of darkness into His marvellous light (1 Peter 2:9); yet, if an unconverted soul reading those words forms the idea that, should God quicken him, all ignorance and error will be immediately dispelled from his soul, he draws an unwarrantable conclusion and will soon discover his mistake. The Lord Jesus promises to give rest unto the heavily-laden soul which comes to Him, but He does not, thereby, signify that such an one will, henceforth, enjoy perfect serenity of heart and mind. He saves His people from their sins (Matthew 1:21), yet not in such a way that they will have no occasion to ask for the daily forgiveness of their transgressions (Luke 11:4). It is not that His salvation is an imperfect one, but that it is not completely experienced or entered into in this life, as such passages as Romans 13:11; 1 Peter 1:5 show. The best wine is reserved into the last. Glorification is yet future.
From: The Great Change, by A. W. Pink, in
Studies in the Scriptures, Volume XXV, Number 9 (September, 1946), p. 24 in the Chapel Library reprint.
The Christian Examines Himself
This inward looking, this self-examination and self-discipline accomplish two chief ends: First, it humbles the believer into the dust before God - a most salutary experience and necessary daily, if pride and self-righteousness are to be subdued. As the believer makes an increasing discovery of the original corruptions of his soul, as he traces the subtle workings of sin, as he sees it defiling all his best efforts, he cannot but cry, Unclean! Unclean! (Leviticus 13:45) and groan, O wretched man that I am! (Romans 7:24).
Second, it deepens his assurance and draws out his soul in praise. For, as he looks into the mirror of Gods Word and sees himself both naturally and spiritually, as he compares each of his features with the portrait which the Spirit has drawn of both the sinner and the saint, he discovers his identity therewith. As he finds, within himself, a loathing of sin and self, a hunger and thirst after righteousness, pantings after God and conformity to Christ, he perceives these are what the Spirit has wrought in him; and, as he traces the workings (feeble and spasmodic though they be) of faith, hope, love, meekness, perseverance, he learns that the root of the matter is within him, and he exclaims, I thank God through Jesus Christ (Romans 7:25).
From: The Christian Inlook, by A. W. Pink, in
Studies in the Scriptures, Volume XXV, No. 4 (April, 1946). Republished: Pensacola: Chapel Library; text quoted is from page 3 of the reprint.