Advice please!

My bf family upsets me they love to talk behind my back and they make comments about my breastfeeding such as why don't you give her formula or would shame me for breastfeeding around family members. I plan to breastfeed for over a year, his mother has not apologized for disrespecting my boundaries when I chose to be the bigger person and apologize if I came off rudely his sister who I use to be close with takes his mothers side and has become someone who I don't feel comfortable talking to anymore. This is his families first grand daughter I don't have family nearby since my mom passed away when I was 14 my dad is in Florida and my main family is my uncle and grandma plus 2 sisters. I've just learned his mom has been telling my bf a lot of his cousins and family dislike me. She really dislikes me also I've decided I wanna cut her out of my life problem is we have our daughter I've already made a decision to not let her even watch my child since the way she treats me is terrible. I've also decided I won't be going to any of his family gatherings for thanksgiving and Christmas and because my daughter exclusively nurses with me to take her down to Florida since she has never met my father. His family is so toxic to me that I feel stressed out and upset since I get along with no one or have anyone to hang out with I don't even get along with his cousins that well. I've talk to bf that I will isolate myself off until I feel comfortable to around such toxic people and I choose to isolate my daughter. I really hate how toxic his family has been to me they act so fake in front of me and I'm tired of it. His mom has no right to not apologize for the things she has said to me. Mommies am I wrong for doing this? I don't have my own mother alive and she has not been a good mother in law. This isn't the whole thing but a short summary we also just moved from living at his fathers house and I had to learn about his families drama from his stepmother I wanna be away from his family. The only thing that ties me to them is my daughter and him