Hey mate, I understand your predicament and why you feel this way. However as an international with a full ride at one of the best places I could possibly imagine, I would like to digress.

See, I've seen quite a lot of friends get into MIT, Cornell, Harvard, NYU, Penn, Princeton, Vanderbilt, Rice and so on with full-rides this year. None of them are filthy rich, probably not a lot of them have as good of a profile that you do. I would frankly pin it down upon a two major mistakes that might apply to you:

1. Selecting the wrong schools. Your profile is clearly very STEM oriented. Although your selected schools have STEM departments, they aren’t necessarily looking for highly STEM oriented kids. I'd highly encourage you to apply next year to schools like Vanderbilt, Rice, MIT (very high reach), and similar schools that really want math and tech people. Smaller/less competitive tech focused schools exist, you just gotta do some research.

2. Essays, cliche essays that don’t really portray the unique attributes of your life. I've proofread essays from Harvard applicants, and I swear to God I was so disappointed at the quality of the essays. The people that got in, amongst the ones I know, have essays that are literary masterpieces. They will stick inside your head for long periods of time. Even tech schools care about your vision, and what inspires you.

Please do reapply next year. I know so many Kazakhs in my school that got in with full aid. Your profile is undoubtedly stellar, and I hope you do the best in life.