加拿大國籍真是麻煩,回趟國還得簽證.

I go to canada becasue i have canada PR, or go back to china because i am chinese. can i stay in usa illegally for more years?
Some people say canada has no labour job. how can i survive there?
can INS catch me if i stay here because of students track system?
canada PR means nothing?
i got master's degree. no green card, no job.
help!
wenwen