If you are not a US citizen and are not a US permanent resident, then you are an international student at all universities in the US. If you go to high school in the US, then you are still an international student as @collegemom3717 has correctly said.
As an international student, your chances of getting into a top 30 university are very small. If you were in the top 1% of the students at an elite famous private high school in the US your chances of getting in anywhere might go from 1% to 10%, but they would still be low. It sounds like you are not going to be one of the top 5 or 10 students out of several hundred at your current high school.
To me it looks as if you are at an expensive high school that you hate in an attempt to get into a university that you are not likely to get into.
However, there are hundreds of very good universities in the US. You do not need to attend a “top 30” university to do well in life. There are also very good universities in other countries. If you want to get accepted to somewhere such as McGill or Toronto you need a high GPA and reasonably high test scores. You can get these at an “okay” public high school in your home country.
I think that you should do as well as you can for the rest of the current semester, and talk to a counselor at your current high school. However, I don’t think that you are gaining anything by attending a high school that you do not like.