Can't afford to pay the expensive international fees at Oxford...

I'm so conflicted right now - I keep doubting myself whenever I made the choice of accepting the offer from Oxford.
As an international student, I am immensely grateful to receive an offer from this prestigious institution. I understand that this is a once-in-a-lifetime opportunity to gain maximum exposure to world-renowned scholars in my field, however, my family will be impoverished and debted once I accepted the offer. Imagining the possibility of my mother doing multiple part-time jobs at once, and the living expenses of the entire household being reduced just because of me is unbearable. 44240 pounds per annum (excluding living costs) is nearly unreachable, even with a 25000-pound scholarship from my home government.

If I didn't go to Oxford, I would resort to a medicine degree in my country of residence. The tuition fee is significantly lower, and medicine is highly regarded by the community so career prospects are much brighter than that of a biochemistry degree at Oxford indeed. However, choosing this option is also difficult as I really love Oxford and would definitely want to pursue 4 of my early adult years at this beautiful city.

TLDR My family would become impoverished due to the expensive required fees for Oxford once I decided to go to Oxford. However, in both financial ability and career prospects-wise, choosing medicine in my hometown is a better option, but I still don't want to give up on Oxford. What should I do?