Growing up as the adult in the room.
You learned to read a room before you learned to read a book. You knew, almost without thinking about it, when to go quiet, when to make yourself smaller, when to step in and fix something before it got worse. You were probably called mature for your age. Easy. Low-maintenance. A good kid.
What that often meant, underneath, was that you were managing someone else's emotions instead of having your own.
Emotionally immature parents aren't necessarily cruel or absent. Often they're loving, even devoted, present at every event, generous in the ways they know how to be. What tends to be missing is a certain kind of steadiness: the ability to stay regulated when a child is upset, to tolerate a kid's big feelings without needing them to shrink, to be the one who does the emotional work in the relationship. When a parent can't do that consistently, a child adapts. Children are extraordinary adapters, so extraordinary that the adaptation can look, from the outside, like nothing was wrong at all.
What the adaptation looks like from the inside
Apologizing for things that weren't your fault, quickly, before anyone can get upset with you
Feeling a shift in someone's tone or a slightly longer pause as a physical alarm, before you can even name what it is
Being the one friends and partners come to with everything, while rarely bringing anything to them
A specific kind of loneliness that doesn't go away even when people are kind to you, because you were managed around rather than fully known
Difficulty identifying what you want, because the question was never really asked
None of this shows up as a diagnosis. It shows up as a way of being in relationships: competent, accommodating, and quietly exhausted.
Why insight into this often isn't enough on its own
You can understand all of this intellectually, read the books, recognize the patterns, explain them clearly to a friend, and still find yourself doing the same things. Still scanning a partner's face for a mood shift. Still unable to ask for help without over-explaining why you need it. Understanding the pattern and changing the pattern turn out to be different kinds of work, because the pattern is a set of responses that got built early, before you had words for any of it, in relationship with someone who needed you to be a certain way.
That's also why the way out tends to run through relationship, not just reflection. Practicing, with a therapist or with people who can tolerate your full self, what it feels like to take up space, to be upset without immediately managing someone else's reaction to it, to ask for something and not brace for the cost of it.
You weren't wrong to adapt. It kept things workable. The work now is about finding out what's underneath the version of you that got built to keep the peace, without needing to blame anyone to get there.