while in graduate school, i found i was eligible for a few thousand a year in subsidized federal loans. i used those to pay off the unsubsidized loans i took out to finish my last year of undergraduate education. this was dependent on my funding mechanism, so i had to wait until i was in my third year of grad school to do it, but it did end up saving a chunk of change in the long run. i wasn't coping with the level of debt you're facing, but anything makes a difference.
i went to a Brand Name School for my phd after spending my undergrad years at a state university with decidedly average-income folks. the people in my grad school cohort were financial fools because they expected to maintain the lifestyle they had with their well-to-do parents. fight the lifestyle inflation and don't let people acting foolish on a grad student stipend convince you they are (a) any happier than you are or (b) any more successful. especially on (b) - it's likely the opposite. practice your smiles and your "i'm happy for you"s and do not let it get under your skin.
a colleague of mine bought a high end car, financed the car, then took out student loans to make the monthly payment. he will be still technically be paying that car off when it's over 10 years old. another colleague bought a house, and was unable to sell (and could not relocate for a couple of good career opportunities) until finally taking a loss to get rid of it. meanwhile, we made a ton of sacrifices, walked away in the best possible (still not fantastic) financial shape, and after spending a couple more years living just a little better than students we are past the burden of student loans.
delayed payoff is rough when your peers are acting like idiots, but feel confident in your frugal choices. they will set you ahead of the pack in the future, and you won't be a part of that pack forever.