@juniorindistress good for you! I understand the initial dilemma, sort of, especially when your parents were encouraging you to make a choice that would put them heavily in debt. I know - it’s Harvard and all, but your other choice is still one of the top universities in the country and I just can’t see how THAT big of a difference in cost could possibly worth it for an undergrad education, especially when you still have to pay for grad school.
Tell your parents if they REALLY want to take out loans, they are free to buy you a new Porsche with the money you will save them, and they’ll still come out $100K+ ahead on the deal. 
(joking)