How to create distance from your partner discreetly

Good evening, everyone. My girlfriend (24) and I (23) have been in a relationship for about a year and a half, but we've been facing some challenges. One major issue is my discomfort with her family and friends; they often treat both of us poorly, and I feel quite devalued around them. Her family is very closed off, and their behavior towards her is harsh, which she seems to accept as normal. Her friends also don't treat her well, and again, she finds it acceptable. I’ve tried to communicate my feelings about these situations, but she doesn't seem interested in listening. She wants me to be a part of her life with them despite my discomfort. I'm beginning to feel like I'm the reason her friends don't talk to her like that as much anymore. Lately, she’s made me feel guilty for wanting to take a step back from her social circle, even though I’ve told her she’s free to do those things without me. I've reached a point where I feel the need to distance myself for my own mental health. It’s a tough decision, but I really can’t handle the emotional strain any longer. Any suggestions for how to do this discreetly?