I would not give up! The things that are most difficult to attain are the most worthwhile. I was waitlisted, interviewed, then rejected by Duke last year. This year, I pushed for a promotion, had many more readers, contacted alumni, really researched the school, and performed mock interviews like no tomorrow.
It's been really great to get some elusive validation for my efforts. Perseverance is a valuable trait! On a side note, when in doubt, powerpose. Fake it til you become it! Good luck and try again!