Have you read the context of that verse before? Who was the prophet addressing? What kind of behaviour that that group considered "righteousness" was God calling dirty rags? Does a judgment made of one nation at one time in history mean that that judgment applies to all nations of all times?
The closer you get to God the more unrighteous you see yourself.
If you compare yourself to the Glorious righteousness of Jesus I hope you see that there is no comparison..
Daniel wasn't able to stand ...Dan 10:8, 17.. Therefore I was left alone, and saw this great vision, and there remained no strength in me: for my comeliness was turned in me into corruption, and I retained no strength.
Exo 3:6 And Moses hid his face; for he was afraid to look upon God.
Rom 3:10 As it is written, There is none righteous, no, not one:
We can't stand before God and live.
Without intervention from God we would die.
Act 9:6 And he trembling and astonished said, Lord, what wilt thou have me to do?
Our righteousness is as filthy rages.
Don't think your rich and in need of nothing .. we need to realize our weakness, so we put faith in God's strength.
Rev 3:17 Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: