You are describing what many call the “Tufts syndrome.” Tufts seems to be a choice for some who really want to go to Harvard, like you. Tufts should not be seen as second best. It is also very selective and competitive and a great school. If Tufts thinks you prefer Harvard, they may not admit you either (and they may not anyway). I would withdraw your application from Harvard and apply early to Tufts. But try to actually love it. (I do not have any connection to Tufts myself but live in the area.)