What are my chances for Stanford? I'm an international student.?

You should apply to a wide range of schools that have pre-med programs, then pick the best that accepts you. You can't be accepted if you don't apply. International students always have some chance of being admitted due to the desire for admissions to maintain a diverse range of students. Even if you aren't admitted to a highly selective university such as Stanford, you'll always have a second chance to apply for your graduate studies. Doing your pre-med at a UC or CSU school with a high GPA is your second opportunity to prove yourself worthy of admissions to a selective university.