First, if you live in the U.S. which I'm assuming but might be wrong, you should really look over your FAFSA forms and see what is going wrong that is putting you in that much debt. The government program is designed to make sure that people don't go into that much debt regardless of how expensive the university is. I also go to a very expensive university and I will likely graduate with about $20,000 - $25,000 in debt, which is much more reasonable. Is the problem that your parents have money but are unwilling to spend any to support you, if that is true I think you can apply to pay the college as a financial independent which should greatly increase your aid. But I don't know too much about that situation.
As others have said, loans are deferred as you go through grad school, after you get out though, I don't know that post-docs pay enough to pay off that type of debt, professorships certainly do though if you can make it to that level fast enough but that's a lot of pressure.
Really though, posting on a message board is not a good way to fix this problem, none of us know enough about your financial situation or about the system to give you good advice, and being that far in debt is a huge deal. Go talk to your college financial advisor and going over what is happening and see if there is a way they can get you more funds or give you an advice on how to deal with that type of a debt load.
~Lyuokdea