What are my choices? I graduated with a Mathematics degree from a top-20 program in Mathematics. I have a good math background (I took many honors and some graduate level courses in my university with good grades with a 3.8+ mathematics GPA, and some researches and reading courses as well).

I applied for the PhD program in math at several universities (none of them is top-10). However, I got a terrible math GRE score (I took it once and only got 30% tile). Even though I believe that test is not a reflection of my math skills and knowledge, I think that test will bar me from going to any PhD program I applied to.

What are some options with my pure mathematics degree? I know some of you would suggest for me to go to some Master's program, but I cannot afford to pay anymore since I am an international student, and I know that I should not go to graduate school if I have to pay myself anyway.

At this point I am pretty much hopeless about my applications, and I think it would be wise to find a new path for my career.
I wouldn't jump to the conclusion that you'll be rejected.  Many programs use a GRE cutoff, but not all.  Wait and see.

If you don't get into any program that you like, I would suggest that you find something else to do for a year, perhaps back in your home country. Retake the GRE (study more this time), and apply to PhD programs again next year.  It sounds like you'll be a very strong candidate if you can get past the GRE cutoff.  I see no reason to give up.

(Also, are your undergrad professors aware of your situation?  They may have contacts at the graduate programs where you applied, and could suggest to them that they not overlook your application.)