While the notion that someone would confess to a crime he or she did not commit may seem counterintuitive to casual observers, the reality is that false confessions occur regularly. According to the Innocence Project, of the 258 DNA exonerations they have handled to date, 25% have involved a false confession.

What are the Six 6 Steps of Confession as Per Law
Examine your conscience what sins have you committed since your last good confession.
Examination of Conscience.
Become sorry for your sins. For sins to be forgiven, the penitent must possess contrition for his/her sins.
Confess your sins to a priest.