An old collquialism, “grow where planted” . You have the unique ability to excel at your not so good public school. T20 schools are always on the lookout for a bright spot at an otherwise dull school. EC’s are not limited to what your high school offers. Find something you really like/want to do and pursue it outside of high school. Much more impressive to see an applicant do something outside school than being the VP of some club. BTW. drop the band thing, it’s bad, your bad and it doesn’t sound like you have any real interest. It’ll just take time away from something your really interested in.
Father of an “unhooked” DD at a T20 school.