I don’t really have a sense of self, but others describe me as having a strong personality. I am autistic, so that might have something to do with it, but I can’t pin down much about my personality except that I’m curious, which is in no way an act (I’ve had to rein it in occasionally for as long as I can remember, so it would be an inconvenient affectation).
Things like kindness, I do “put on,” but I’ve been doing that long enough that I don’t need to think about it, like saying “Gesundheit” after a sneeze, it’s a well trained response. It does make me internally reject any external comments that I am kind though, because I know it’s not real.
At the same time, I would never judge someone by the thoughts that flit through their head, but rather by the things they do. By that standard, I understand that I am technically kind, but I much prefer to phrase it for myself and others as “person X acts with compassion/kindness/etc.” That way the person ostensibly being complimented doesn’t have to have a weird impostor syndrome moment and can just accept it, because how they act is provable, and who they are isn’t.