yes, you are late. there are thousands of applications before you. but that doesn't mean you have no chance. as long as your stats are good, you will get in.
Not as late as people make it out to be...bear in mind even july was considered late by SDN standards. We're a paranoid bunch. It takes many schools the whole year to fill all their seats.
calm down, my app wasn't completed until 8/23 last year, and I had 7 interviews before dec 1st, accepted to 5, waitlisted at two, and had a few interviews after dec 1st that i canceled