To look forward to it, or to not

Hello guys and girls,

I haven’t yet started college but I’m beginning this coming fall. I’m most likely going to attend Imperial College in London but I was slightly disappointed with my US acceptances. My grades were almost perfect throughout my high school but my ACT(28) let me down I guess. 800 SAT 2 Math and 750 SAT 2 Physics. I am an international student, yes, and therefore bullied in the admissions process as it is way harsh on us. If I do go to Imperial rn, are my chances of transferring to a college like Cornell/Caltech possible, or should I go to a US College instead (Purdue/Wisconsin-Madison) for my transferring chances to be easier? By easier I mean a greater possibility, as these colleges are extremely hard to get into, let alone transferring. I am planning on re-doing my ACT and SAT 2’s.