Im not sure how to leave the situation im in

My “gf” and I havent been intimate in months, we had a huge fight in september last year and it was kind of like a light switch, she had some irl things going on at the same time we had a fight. She had to leave for a little while but when she came back she wasnt the same. She would only give me the cold shoulder, not say anything to me or talk to me reasonably. I feel like I take care of everything while also balancing bills/needs. I cook, I clean, I take care of the pets, I go grocery shopping and I drive her where she needs. We used to be so close and now I cant even be near her for an extended period of time without feeling anxious. She always talks to me in a pissed off tone, and it always feels like im doing the wrong thing in her eyes. Im tired of always feeling so anxious, I feel like im a kid again and Im waiting to here my moms ex pull up in the driveway, not knowing how much trouble im in. I tried to talk to her and have normal conversations but it feels like it ends up in a fight or awkward silence. From the beginning of my relationship its felt like it had been a struggle, she would rather help others with her problems rather than fix her own. I guess in short I always feel small and im just tired. I dont feel like enough if that makes any sense. Im not really sure from here on. Thought about quitting my job and just going home and not dealing with any if it anymore.

What do I do?