That is definitely a tough question. Do you think that grad school itself is not for you right now, or do you just want a different program?
First of all, whichever you do, it has to be seated deep within you. If you quit, for instance, and it ends up coming up at a job interview, you're going to have to answer that question with confidence. There are good answers for every choice you can make here--you just have to believe in them enough to defend them without shame.
If it's mainly the program, talk to your advisor and talk to the department chair. That's what they're there for. They had to choose their own fields and they know you do, too. They can explain your options, of which you may have more than you realize. Also, if they're not supportive, that's a great reason to pick a different program. You can also talk to the graduate advisor of record and/or the department chair for a department you are more interested in.
I went to grad school about four years after graduating undergrad, and I quit a few weeks in because I hated it so much. All my anxieties came back, I felt like I was failing miserably, and I was already struggling to make myself do any homework or go to school. It was hard, but I actually had to redefine my self-image in a way that didn't rely on my education level. That sounds obvious, but it turned out I was really wrapped up in that. I had to be okay with hearing myself say, "Maybe I don't actually want a Ph.D." (or Master's, in your case). Until then, I hadn't realized that graduate degrees were something you could want. To me, they were just something you did if you were worth anything.
10 years later, I'm getting my Master's in May and I'm waiting to hear back on a Ph.D. program I'm excited about. A lot of things have changed in the meantime, but mostly, they're very particular to my situation. The important thing that changed is that I realized what I'd always thought I wanted to study wasn't as interesting as I thought. It was close, so it wasn't obvious that it wasn't the right field for me. But I came to peace with that, and I did end up finding something that really was of great interest, and here I am. I was excited when I submitted my application and I was excited when I sat down for my first class, even though I hadn't been in school for 15 years by then and I struggled very much in undergrad. I'm just as excited now--I'm actually having fun. I encourage you to hold your experience to a high standard for what you want in your life.
One last point--if you're really miserable, taking care of yourself is important, and the right decision may be not to wait out the semester. If your parents are worried about the money, consider offering to pay them back over a period of a few months or years depending on how much it is. Consider also that if you wait out the semester, you won't get any credit for those classes in the job market. You may be able to apply them to another program later but it's iffy. The money is already sunk, so it shouldn't weigh too heavily. However, if you're doing okay and just not satisfied, I'd say, finish the semester. Maybe you'll have some insight and change your mind. If the semester ends and you're still not sure if you want to switch or quit, you can apply for a break for one or two semesters, usually.