Can you study in your own country? A lot of PhD students in the US are international students. You might not get into MIT or Caltech, but if you do very well in your own country (and probably well on the Physics GRE subject test, as many programs require it), you have a good shot at getting a funded PhD position at a US university. Funded means (1) your tuition is covered, and (2) you are payed a stipend to live on. Not very large, but it is something. That is probably a better course than paying to come to college in the US. One of my kids is in a Physics PhD program at a state university in the US, and quite a few of her fellow students are internationals.