If the $25,000 debt is entirely federal student loans, ask the guarantee agency that holds your defaulted loans about income-based repayment. This will base your monthly payment on your income, not the amount you owe.

Your primary focus for now, however, should be on getting some sort of employment to help your pay your basic living expenses. Without some income, you have no way of paying off the debt, and wage garnishment will not occur if you have no wages.