I feel trapped in a toxic workplace

I've been working as a receptionist in a small vet clinic for 2 months now and it's the worst job I've ever had. I graduated in May with an AAS in animal science, and got this job as a receptionist because of the minimal options due to covid-19. I was told at the beginning that the doctor is bad at communication and often makes the techs feel/look like idiots and will never show any appreciation. I saw one of the girls cry at least everyday. I was never really trained to do very much, and if I got taught something it was probably because I was in trouble for not doing or doing it wrong first. I noticed pretty quickly that I was on my own for learning a lot of stuff, and of course I continued to get in trouble. Even when I was doing something the way I was told by one person, I would probably be yelled at by someone else because it was wrong. The office is all women and it might as well be a high school locker room because when one girl has the day off she is absolutely the number 1 discussion topic for the day, the good, the bad and the absolutely no ones business. The doctor called me and the other receptionist my age (who had been there for 3 years) "slutty looking" and we were told to cover our cleavage and no jeans, but The other receptionists who are the doctors age (50s-60s) wear jeans daily, and their shirts are just as low but their body shapes don't show cleavage in the same style shirts. Being told to dress more professionally is fine but the words used are unnecessary and I was never given a dress code of any kind. I also think its interesting that nothing was said until 6 weeks after I had been working there. I cry a lot, I think about walking out everyday. But instead I sit there and work through my lunch and try to get everything done and clock out on time but stay late and am still criticized everyday for my lack of effort and work ethic, and I still can't get everything done and even on my day off I'm trying to figure out what I'll be yelled at for tomorrow. I'm miserable but I can't imagine I'm qualified for anything better, and if I can't do this, then I'm not sure I can do anything. My confidence is gone, I'm pretty convinced that I know nothing and I'm terrified to put in 2 weeks notice and have things get worse for 2 weeks. I've been thinking about going back to school but I'll be 30 next year and I can't imagine how I would pay for it or even what I would want to do. I make barely over minimum wage and I'm not convinced that any of this is worth it.