Mortal Sin and Resolutions for Reparation for Sin

We would encourage you not to overthink things. You’re personally obligated to make a firm purpose of amendment regarding the sins you confess in Confession, and to follow through on the penance the priest confessor assigns you.

And it’s good to do reparation for the sins of others, but don’t become preoccupied with failing to remember to do so, even if you mentally committed to do so previously. In addition, you may be experiencing scrupulosity, which encompasses seeing venial sin where this is actually no sin and mortal sin where there is at best venial sin or no sin at all. Speak to a good local priest who can guide you further in that regard.