Your responses here are thoughtful and articulate.
The issue with the educational platform is the word “crafted.” Usually the candidate and advisors “craft” a platform. It is just confusing to use that word. I am not sure what your role was, but perhaps you wrote what is on the link? That is not the same as “crafting” the “platform.” That means you did some writing or editing for campaign materials.
It appears that you are genuinely motivated by a desire to effect change, that your career goals are altruistic, and that you see college as a way to pursue those goals.
The response to your activities list can just point to the possibility that your activities may seem spread across too many organizations, or that your activities lack depth. I don’t think that is the case, but hopefully this thread helps.
Many kids narrow their focus in late high school and college. Music, theater and politics all require a kind of passionate commitment. Hats off to you if you are managing such a rich and busy life. But be aware of appearances too and make sure you are accurate and don’t overstate however unintentionally 