I have heard that if you forget to confess a mortal sin, you are supposed to confess it at your next Confession. What if there are venial sins you forget to confess, however? Are you obligated to confess them at your next Confession or is your Confession not valid? I forgot to confess some swearing and inappropriate language/joking around with friends. I would say that these sins probably were venial.
What if there is a mortal sin that you cannot remember if you have confessed? I have some sins in that past that I cannot remember if I have confessed. I am positive that I have confessed things very similar in nature to them if I have not confessed these specific sins (I know that I have confessed the similar sins because I have gone to confession for them many times; for whatever reason, this other particular thing just didn't stand out as much in my mind at those confessions). These sins were a while back, and although I have been to Confession many times since them, I cannot remember if confessed the exact acts. I'm not sure if I'm just being scrupulous or if this is something legitimate.
If you have committed many of the same mortal sins over and over in the past, is there ever a point at which you cannot be forgiven?