You might not be getting as many responses because it isn't college application season.. more people are going outside (!) than fretting over this stuff.
That being said, I can only comment for sure on Chapel Hill and Duke (I live in NC, will be attending Duke this fall). Keep in mind that UNC is a public school and has to accept something like 81% of their applicants from North Carolina. So, you'd be competing for 19% of the spots. However, you're a strong applicant and from a different country at that, so if you keep up your grades and submit a nice essay, I'd say you have a great chance.
As for Duke... my ECs were CERTAINLY not stellar (my main leadership was being president of the Spanish Club). But, my essay was extremely heartfelt and I took a total of 11 APs, I was in the top 2% at my high school, and my SAT was 2270. So, don't think you have to be perfect in every aspect, because my ECs were not. (Then again, I'm from NC, which may have helped me a bit..)
Anyway, good luck, and have fun! I'm a firm believer in "everything happens for a reason," so you'll end up where you're meant to end up.
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