Assuming that if you were able to go back to that point in time and everything beyond that point happened in the exact same way with the exact same responses by you, yes.
Kinda feels like my systems past. I have d.i.d. and often feels that way. Memories of someone else that wasn't me but I'm now someone else with the same memories but not the same person
Anemoia, if I'm not mistaken, is a feeling of nostalgia for something you haven't experienced yourself. I think the OP is referring to themselves from the past?