So, back up and take stock:
- You are an international student. Most US colleges have about 8-15% international students in each year. So, whatever the acceptance rate is for US students, it is much lower for international students.
- If you need financial aid, that makes it extra hard: you have to be a good enough candidate that they won't just accept you- they will have to want you so much that they are willing to pay for your some/most/all of your education.
- You need to figure out what the relative importance of each element: Ivy / CS / USA? As noted above, not only do the "Ivies" have some of the lowest admissions rates, they are not necessarily the best options for CS. They also have some of the lowest admissions rates in the world. So is the priority to be in the US? or only if the name is famous enough to be useful in Turkey?