I think your stats are pretty impressive all around, maybe the subject test scores are a little on the lower end. You have a very high rank, great leadership roles, and evidence of community service on an international level, which is pretty impressive. Your ECs are definitely tailored toward medicine, so that will show your interest to washu and their medical program.
I would say you have a great chance of getting into WashU applying ED and maybe cornell could be considered a slight reach. however, you also have a solid chance with JHU too.
Chance me?
http://talk.collegeconfidential.com/what-my-chances/1790305-chance-me-for-top-schools.html#latest