Ok, I understand the 3 requirements of grave matter, full consent, and full knowledge, but in practice, this is not terribly helpful.
I am scrupulous, but even if I wasn’t, I’d still be none the wiser about many of the sins I commit, and whether or not they are mortal sins.
I heard St Alphonsus said to scrupulous folks, to give yourself the benefit of the doubt, but I find this conflicts with the idea of not receiving Holy Communion in a state of mortal sin, and if you are unsure of your soul state, then you commit a mortal sin since you show yourself prepared to commit evil (receiving Holy Communion unworthily) just as quickly as good.
I am not a happy camper, as tomorrow, the First Friday, I was hoping to go to Mass and receive Holy Communion. Now I am not sure I can.