I resent my siblings and I'm losing a mother-daughter relationship with no will to save it
Do you think the reason behind it can be something like you're unhappy about being adopted?
No i don't think my mom could ever do that.
Families are expected to stick together and keep in touch, but sometimes you can feel as if you're growing distant from them. If you lose your familial connection, you should end up not having someone there for you in times of needs or just important events in general. Try reaching out to them, even if its just for small talk.
It's not because of that. Sometimes people just grow apart from each other. I also see them rarely anyway.
I think it might be worth trying to stay in their lives. Maybe show up at your parents house for holidays. If you have kids don't you think they deserve to know their aunts and uncles?