Choosing major other than one with most demonstrated interest?

Specific example: I chose a major( let’s call it Major A) that, while I have taken challenging classes (inside and outside the classroom), does not show as much demonstrated interest as a second major (Major B). While I did mention my love for Major B, my prompts for Columbia addressed Major A as a desired major and as a drawing point for Columbia. Should I scratch my essays and write about Major B or should I keep my essays (which really do show my interest in Major A)?