Try to live by (under) God's Law and you will be crushed into dust. Live by (under) His grace and you will be finally free to obey.
Christ fulfilled the Covenant of Works on your behalf. "In Him" we are as righteous as if we had. On our own, we are incapable of law-obedience. If biblical history has not made that abundantly clear to you, then Christ's Sermon on the Mount should have.
To "live" under God's grace [provided in Christ Jesus, who shed His blood and died to save us from our sins], is to obey God, in repentance, and to keep his Commandments in love for what God provided, John 14:15; Exodus 20:6 KJB:
Jude 1:4 KJB - For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.
1 John 3:4 KJB - Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.
1 John 3:5 KJB - And ye know that he was manifested to take away our sins; and in him is no sin.
1 John 3:6 KJB - Whosoever abideth in him sinneth not: whosoever sinneth hath not seen him, neither known him.
1 John 3:7 KJB - Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
1 John 3:8 KJB - He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
1 John 3:9 KJB - Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
1 John 3:10 KJB - In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.
Antinominians, redefine the Law of God these days, and redefine grace.
Herein is Grace, He provided the Lamb, bought them, and brought them out, God saves in His mercy:
Exodus 20:1 KJB - And God spake all these words, saying,
Exodus 20:2 KJB - I am the LORD thy God, which have brought thee out of the land of Egypt, out of the house of bondage.
Herein is obedience in love for that Grace:
Exodus 20:6 KJB - And shewing mercy unto thousands of them that love me, and keep my commandments.
Repentance is turing back to God, in loving obedience.
Repentance is not claiming to turn back to God in all pioints except one - Exodus 20:8-11 KJB.
Romans 6:1 KJB - What shall we say then? Shall we continue in sin, that grace may abound?