Most loans offer prescribed repayment plans. You also have the opportunity to consolidate them into another private, or possibly government-sponsored subsidized loan. Discussing your options with your loan provider, or with the department of education would be a good place to start.
Private student loans are the worst of both worlds. They are not dischargeable in bankruptcy, but have none of the protections or payment plans required for federal student loans. Your options will vary with your lender, but they are not required to offer a lot of choices.