We are different there too.
I believe we have to actually stop the sins we repent of doing.
Indeed we do... Yet as Paul says, we are to "run the race set before us..." Hence the ongoing struggle... One sin at a time, and so often, we find that we have a sin of which we were unaware... And as the Psalmist writes: "For I know mine iniquity, and my sin is ever before me..." We have ingrained patterns of sin, and the working of our way down into the layers of the onion of self-denial is indeed the Great Work of Salvation that God appoints... The mortification of the will of the flesh as we progressively overcome the world following Christ...
Scripture says Satan flees from those who submit to God.
Submission to God is progressive - We cannot just say: "I repent" and it all just disappears...
Many are the trials of the righteous, and Scripture instructs us to persevere against sin in the Faith to the end of our lives...
No one is ever too exalted not to fall...
So how is it such doom as you describe?
It is a worthwhile undertaking, done in purification of the heart, in a genuineness of soul, in lowliness of soul, for the sake of the Kingdom of God...
It is joy and anticipation as we sorrow for our iniquities... Our native lawlessness in this fallen condition... Our infirmities regarding sin...
And there comes a time when God puts some of us pretty right...
But only by His Good Pleasure...
To those who have pretty much died to the world...
God's doing, not man's...
Man repents - God Saves...
Salvation is Union with God - The Marriage of the Lamb...
KNOWING the One True God and His Son, Jesus Christ...
Arsenios