When God comes to Cain after he killed Able, Cain lied, “I don’t know where Able is! It was not me and I don’t know about it . People are healed when they take responsibility for their sin.

When God came to Adam in the garden after he had disobeyed there was no words of judgement - only inquiry "where are you ?" If Adam had of said I have sinned, please forgive me God would have done so.

It is a principle. If we confess our faults God forgives us and cleanses us from all unrighteousness.

Adam blamed Eve. This is the Adamic nature; our fallen behavior and while we blame anyone but us, we cannot be healed.

Cain could have repented and been forgiven. David repented and found forgiveness. Paul repented of murder and found forgiveness.
Friend, trust in Gods unfailing mercy and forgiveness that is offered to everyone who repents and confesses their sin. Only faith will move you forward to your future and receive the cleansing you need. Don’t allow your future to be limited by the past and don’t let your past determine your future.