Do not even consider $100k in loans. NO school is worth that! Not even an ivy, and BU (a fine school), certainly is NOT worth that much debt.
Besides…YOU can’t borrow that much. Your parents would have to naively cosign and most won’t do that because THEY would be stuck with the debt if you can’t pay it…and usually newish grads cannot pay that much debt back.
You can borrow $5,500 for your frosh year.