From the other side, a viewpoint which might be helpful but might not...
My sister went NC with the entire family years ago. She clearly felt deeply hurt about something but she was very ill (both physically and mentally) and decided to not only go NC but also to lash out before she did so.
She told me she 'used' to love me. She wrote my 70+ mother a 25 page letter stating everything she had ever done wrong as her mother. And that was it.
It's deeply hurtful not only that she did this but also terribly sad that she felt this was necessary and couldn't speak to us.
She's missed out on numerous holidays, events, babies, weddings and she could have just spoken to us all and we would have listened to her. It feels like she just 'gave up'.
I haven't contacted her as I'm trying to respect the fact that she told me to leave her alone numerous times during our last contact but I cannot put it down. I think about her all of the time and I hope she's ok. But there is nothing I can do now.
I obviously don't know the people in your life but would it be worth explaining to them that you are deeply unhappy with these relationships and would go NC and the reasons why, with examples, so they have a chance to listen to you?