Bankruptcy Issues: Sallie Mae Private Loans and Filing Bankruptcy

My question involves bankruptcy in the state of: MASSACHUSETTS

I wanted to know if it's possible for me to file bankruptcy on my private loans by Sallie Mae? I'm permanently disabled and do receive social security benefits therefore my source of income is very, very limited. I am unable to work. I just cannot afford to continue paying for these loans. One of these loans has a co-signer - if I do file bankruptcy, what will happen to the co-signer? Will co-signer also be dismissed?

Thank you

Bankruptcy Issues: Sallie Mae Private Loans and Filing Bankruptcy