What are my chances at admission?

You should be able to get in at Wash U. and Notre Dame (and maybe UPenn). Your academics and test scores are probably good enough for the others, but your extracurriculars may not be strong enough. But great recommendations and interesting essays might help get you in. You should probably pick a few more schools that aren't as selective as Harvard, Stanford, Duke and Cornell because it's hard to get into all of them.