Hi there. Your ECs are really spread out in different areas. Usually, (from my past XP) BSs look for passion maybe in one area, I'm not sure if I see that or not. Maybe, is your passion music and theatre? If so, try looking into the music and theatre programs at each school and sending in a recording of you playing. I do agree with Brooklyn though, you are applying to a very selective bunch of schools, so try and add at least one safety or match to the list. Right now, I'm not sure the boarding schools will get a sense of "you." Use you essays to come through as a mature person, and ace your interview. The essays and interview will be crucial. Sorry if I'm being a bit harsh. Don't stress about it too much though. You definitely have a chance, but you can decide how much of a chance it is with interview/essays.
(Sorry if anything I said above is incorrect, sorry, I'm not an admissions officer)
Good luck!