Hi there, I completely get what you are saying and I am so sorry about what you went through!
I think I probably need to clarify, I do not really mean that it happens as an adult, I think it may happen as a child. I think in my case, I feel that I understood more than I had the emotional skills to cope with. So I could intuit people at a high level, but did not have the maturity to deal with what I what I could see.
As an adult I share much more and not particularly worried about what others think of me and I never have problems sharing in a one-to-one situation.
However, it is my group of friends from school days that I still have a lot of contact with that are a different kettle of fish. In their case, I feel like they seem to not really see me. I seem to be the person they turn to when they need advice, but I feel like my attention and care for them is not reciprocated. They also appear to be going through a midlife crisis as a group and when we get together I feel like they turn into teenagers again (in the worst way), dismiss me and are quite unfeeling when I have a problem. Frankly, I feel like I am in high school. So I have distanced myself from them quite a bit, because I feel like they are not good for my mental health at the moment, which is sad.