Hi Seasons,
It must be terribly hard to separate yourself from the familiarity of having siblings you "belong to", even though these relationships don't sustain you.
I know it was painful for me to face the utter end of my relationship with my brother. And objectively, he's a dishonest, abusive, sociopathic bully whom I'm much better off without. Yet, still...it was confirmation I'm one body more alone in the world.
The only way I've found to deal with this has been to very very intentionally (and for 20+ years now) created a substitute extended family. I have found that in the UU church. For others, it would be a different one.
For me, it's been a place to share my gifts and learn that I could display my weaknesses, and still be loved.
You deserve that too, and one thought you could try if it makes sense to you, is: All the hours of suffering and worrying I spend on the Nfam, I could begin to use to build a chosen family, instead.
love to you,
Hops