There is great hope even for a cut-throat, if he makes a strong determination and takes up the spiritual path. Sin is a mistake committed by the ignorant Jiva during his journey towards the Satchidananda abode. Every mistake is your best teacher. One has to evolve through sins or mistakes. Mistakes are inevitable.
Some people become a prey to thoughts of sin.
This is a great blunder. Do not brood too much on the past events. Learn the lesson and forget the past. Once you make up your mind to tread the path of Truth, all sins will be destroyed. There is no such thing as eternal damnation or eternal hell-fire for the sinners.