@BethanyBlack I feel this, but for a slightly different reason. It's only just recently that I've started processing that I don't know what my own needs and boundaries are because I spent so much of my adult life adjusting my boundaries for everyone else, that it just felt normal.
Once I kept adapting for other people, they expect that I will continue doing that, and realising that the one of the reasons I'm constantly out of spoons is that I never say "This far, and no further" is massive.
It just sucks that the people in our lives who we most need to respect our boundaries are the people most likely to jack up with us for setting them in the first place.