I'm in the first semester of postgrad math. I'm not able to cope up with what I've chosen to study. I'm getting really bad grades. I don't know if I'll be able to even pass at this point.

I did my undergrad in math and stats. I never found that challenging at all.

I'm so miserable nowadays. My mental health has deteriorated alot cause I don't understand most of what I'm studying even after spending hours with it. I'm going to talk to a professor tomorrow since I failed his midterm.

But I don't want to do this anymore. I want to change my degree.

I'm also a TA and I enjoy teaching math at a high school/undergrad level. I want to switch to a graduate diploma in teaching but I'm on a student visa for the degree I'm currently pursuing and I feel so trapped. Has anyone gone through anything similar? I'd appreciate any advice right now.