I’ve had this happen a few times:
I have gone to confession and started to confess serious sins from my distant past that I forgot about through the years. (I went many years without confession and I was a lax catholic). From time to time, serious sins from my distant past come to my attention when I think about the past or when I do an examination of conscience. On some occassions when I start confessing a list of past serious sins, I have been cut off by the priest and he has asked me “Are you sorry for all of your past sins?” and I reply “yes”. Then he proceeded to give me absolution for all of my past sins and the confession is over. Is this OK? Am I forgiven for all of my past sins?