Depression in making? I chose masters over job and regretted that decision

Hello! My question is short but I have to write about what triggered those questions. Thanks in advance for taking time out to read and replying.

I am a first year Masters student who is eternally (wouldn't say it is the wrong word) anxious and thus stressed. This all started in July, after I completed my graduation. I had a job offer at one of the big four accounting firms, albeit at a package I didn't like. At the same time, I also had the option of going for Masters because of my graduation score being too good. I decided to go for Masters because of the following reasons:

A. My parents were against me working immediately after graduation, and they left no stone unturned to make me conform to their thinking.

B. I didn't like the annual salary which the company that offered me the job was offering me, so I got tilted towards pursuing a Masters. But, the course wasn't anywhere near to what I thought it would be. Since I got admission in the same University from which I graduated and it is one of the best universities in the country and my parents' dream university for the course, I had expectations. There were 200 students in my class and the teachers didn't take any special interest in teaching. Consequently, I stopped attending classes at all, didn't interact with anybody, and sat at home regretting my choice. Three months passed.

Come exam time, and I felt overwhelmed by the amount of syllabus and diificulty level, which were 20 times as comapred to those during under-graduation. I decided to give up.

Now, I have an exam tomorrow of which I don't know a word. I know that I am going to fail, but can't stop over-thinking (yes, right!) about it. I feel like crying and cursing myself for making a wrong decision that can affect my career adversely.

I know it is all my fault - not attending classes - but don't know how to prepare myself mentally for the remaining three semesters. Also, I think it is my parents' fault as well for not having been as excited and happy as I was when I got the job.

I don't know what to do now. I need some guidance or rebuke, whichever I deserve.