I was an only child for 4 decades and now I have siblings.

I am really struggling these days about my own feelings. My relationship with my mother has somehow changed. I am mourning and I don't really understand why? I have hurt my mother and I didn't mean to. I have shared my feelings over her new relationship with two children that she gave up many years ago and it is not how she expected me to feel. I don't really know what I am feeling. I want to protect her and them and me. I honestly don't yearn for a relationship with them. I don't dislike them, but I have enough going on in my life with the family that I created. I really don't care if she has a relationship with them, but she appears to be trying to make up for all the past. It has made her alive, which is good, but it makes me feel as though the family she has now just doesn't do it for her anymore. This is, at times, extremely complicated. If I stay back and give her space, she thinks I am mad. If I express my feelings about her getting way too close to them, she gets mad and thinks that I somehow have lost my compassion for the human side of this situation. It really couldn't be further from the truth in my opinion. I just don't know my place in my own family anymore. I am so yearning to get some peace within my soul on this thing. It has been 2 1/2 since the reunions.