If you're worried about your repertoire, don't be. Playing a Bach concerto at a good level at 16 is not a bad thing! If you are motivated to work hard, you can easily work up the audition requirements at almost any school you choose. My advice is to apply to a bunch of schools at various different levels: maybe a couple of schools that aren't as well known (maybe smaller, private colleges with solid music programs like where I went to undergrad), some right in the middle (including big state universities: UMD would fit in the higher of this level, or maybe the lower of the following), and some at the top tier (Peabody, Juilliard, Rice, etc).