I'm a high school senior too and I only recently got accepted at Carnegie Mellon and Stanford (didn't apply to Ivys or MIT). First, you should get over the rejections. Last December, I applied for Cornell ED (36% acceptance rate) and I got rejected! I couldn't quite figure out why but now, five months later, I'm really really happy cos it gave the opportunity to apply for Stanford/CMU during RD. And Stanford had a RD acceptance rate of 7.2%. Only Harvard has a lower rate. So, shit does happen but good things also happen.

Anyway, as an international, I can't get financial aid at most schools (only Harvard, MIT and a few others are need-blind for intls). So, I'm faced with a similar question. Is it worth paying so much for Stanford or CMU?