For I decided to know nothing among you except Jesus Christ and him crucified. (I Corinthians 2:2 ESV)
Sacrificed
A family paid a scholarship that enabled me to attend seminary. I do not remember their name, but I sure did while in attendance. We attended an annual dinner the school sponsored to thank the generous group of donors. I wrote periodic letters giving status and giving thanks. I thought of that annual gift often. Remembering those donations instilled both a sense of general gratitude, and an occasional burst in motivation to study and learn.
Christians do not merely remember Jesus Christ. We remember that He was crucified.
So here is a thing to try.
Every time you become aware of something sinful in your life, rather than merely grieve and mourn, remember His crucifixion and thank Him for His donation.
Sin does not only require a reaction of sorrow and sin-hatred. We also get to remember and rejoice that the very sin we are noticing was paid for by the crucified Jesus.
Jesus did not pay for a vague bunch of sins. He paid for every time you are selfish, jealous, impatient, arrogant, ignorant, and lazy in good works. So they are gone. So we can rejoice!
We can not overcome our sorrow over sin. But because of Christ, we get to rejoice!