An adoptee may “know” they belong with their adoptive family but there is this “other element”, this feeling that they ALSO belong somewhere else. A need to know, to be complete inside. Otherwise, never whole. So the adopted person doesn’t actually feel like they belong with the natural parent(s) either – if they end up reunited.
Like one is a broken circle. Like they have this person somewhere inside of them that they have not been allowed to be. Like walking on a fence that one can fall off of at any moment.
Adoptive parents have a certain insecurity. They live in fear that someone is going to take their child away. That is their deepest darkest fear. At the same time, the adoptee always feels like they are going to be rejected.
It is entirely not a “normal” situation and there is no getting around that.