Wow, that is a really really high interest rate. I went to a really expensive engineering school for my bachelors and masters so I owe about 130k on my own. I just consolidated my federal stuff and it will end up at like 1.6% or so after 3 years of on time payments. The rest of my loans are what they call private loans, still education ones, but variable rates and the highest one there is 7% I think and that is real high to me. Right now it sucks because no one really consolidates private loans unless your rate is above 8% so I can't consolidate those. All in all, I pay out about 900 bucks a month or so just for student loans.
I am also getting married next May and my fiancee has about 20k in loans so that will bring the total up to about 150k or so for both of us. Student loans suck, but it was all worth it in the long run. Look around, I guarantee you can find a better rate than 15%, that is killing you.