The book of Numbers calls this sin, "a high hand," a flagrant sin that has become such a normal part of one's life that it reeks of arrogance and pride.
Should we not be praying the previous verse, Ps 19:12, "Who can discern his ways? Acquit me of hidden faults."
Many times we cannot even see our sins, it may take an objective person to point it out. And never discount Gods use of such means of grace - another person! They may be just whom God has sent.
Cry out to Jesus even now to show you your "high handed" sins. He who raised His two hands and received the nails is able to prevent your sins from ruling over you.