Common app main essay

Hi I’m an International student considering applying to Princeton SCEA. My intended major is math.

I have one question about the common app main essay. Is it supposed to be related, either directly or indirectly, to my intended major or just academic interests in general? I was going to write about something totally unrelated, like some family events that shaped my personality, etc… Is this a bad idea?

I would appreciate any comments!! Thank you very much in advance :slight_smile: