If you are a nonresident, you should be filing a nonresident US tax return.
TurboTax does not support nonresident returns.
However we have a partnership with Sprintax offering a nonresident tax filing solution to our TurboTax customers.
Visit the TurboTax/Sprintax site for more info or to get started.Also, your SS benefits may be treaty exempt. Check with Sprintax.