Can God use me even though i’ve failed

Not even though — Scripture’s pattern is closer to by way of. Look honestly at the roster. Moses killed a man and then led a nation. David fell catastrophically, then wrote half the Psalms you have cried to. Peter collapsed publicly on the worst night in history and preached at Pentecost weeks later. Paul held the coats at a martyrdom. “God hath chosen the foolish things of the world to confound the wise... and base things of the world... and things which are not” (1 Corinthians 1:27-28). The list of unusable people is the list He keeps using.

This is not because failure does not matter — sin is real, and its damage is real; where repentance is needed it is available and undramatic (1 John 1:9). It is because God’s criterion was never an unblemished record. It is a returned heart. “The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise” (Psalm 51:17) — written by David after the worst of it. Not despised. Wanted, even.

And there is a reason beyond mercy. A person who has failed and been restored carries something the untested do not — actual knowledge of the gap and of the bridge. That is why the restored are so often the gentle ones. Your failure, brought home, becomes your credentials in the rooms where the untroubled cannot get a hearing. “He which hath begun a good work in you will perform it” (Philippians 1:6) — begun in the mess, performed through it. You are not disqualified. You are, at minimum, qualified for the rooms you have already been in.