Have you applied to schools other than PEA? While you have a shot I would not say your chances are strong enough to make it your only application if you care about going to boarding school in the US.
Especially when you say your current school is not particularly rigorous I’d question if PEA is even the right school for you. You have an interesting resume - consider looking into other schools that might be a better academic fit and appreciate all the ec’s you’re passionate about.