Admissions is tougher all around for international applicants - even full-pay applicants. Other than the few places that have automatic admission for stats and extend that to international applicants, what would be a safety for a US applicant is more like a match for you. Whatever you see as a published admission rate for US applicants is likely to be more than twice what the admissions rate is for international applicants.
Do students from your own school regularly apply in the US? If so, what has their experience been. That will give you a better notion of what your odds are.