Confession is good for the soul. I have no problem humbling myself before the King of glory, acknowledging I am a sinner and thanking Him for His provision. Every time.
Asking God for something He has already granted is unbelief that it is already settled (2 Corinthians 5:19 KJV). I mean, how much "unrighteousness" does the believer today have that is in need of cleansing? Who ever told you that this passage means to vocalize your sins to God was lying to you. It is a religious notion and not what the passage has to do with at all.
I'm thrilled that you believe you are. Then there's no need to confess in order to be forgiven.
There's a huge "if" on 1 John 1:9 KJV. It's not written to you and it's not about a vocal confession of a list of sins (Hebrews 9:22 KJV).
1 John 1:9 KJV means exactly what it says, as it says it and to whom it says it. It is just not written to anyone in the dispensation of the grace of God. It's not our good news.
1 John 1:9 will happen in that day when a fountain is opened to the house of David and to the inhabitants of Jerusalem for sin and uncleaness.
Zechariah 13:1 In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.
"That day" would be what many refer to as the second coming of the Lord (the Body of Christ has already been caught up to meet the Lord in the air 1 Thes. 4:16-18).
This is in one accord with what Peter preached in Acts 3:
Acts 3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord; 20 And he shall send Jesus Christ, which before was preached unto you: 21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Act 3:19-21 has nothing to do with the Body of Christ either. It is to Israel, who look forward to the blotting out of their sins. That's what it says. For that is God's covenant unto them when He shall take away their sins.
Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in. 26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob: 27 For this is my covenant unto them, when I shall take away their sins.
Israel looks forward to their sins being blotted out while we in the Body of Christ look back to the cross. We have already received the atonement.
Romans 5:11 And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement.
Now, are your sins in remission looking forward to blotting out or have you now received the atonement?