Hi H,
Are you saying that there are sins you are NOT sorry for?
If this is true,,,then, that sin is not forgiven. Scripture clearly states that we have an advocate with the Father if we commit a sin....but we DO have to be sorry for it. I think that even if we don't FEEL the sorrow, we should fall at God's feet and ask forgiveness of all our sins, in Jesus' name. Amen.
God knows how our heart is and He's always more than ready to forgive.
If, instead, you are sorry for the sin but never confessed it,,,that is no problem...God KNOWS you WOULD HAVE confessed it.
It's never frying time for those trusting in Jesus that are trying to do their best and are sincere.