YOu can't get back from the IRS, what you have not already paid to them. The *ONLY* taxes you have paid for 2017, is the taxes that were withheld from your paychecks in 2017. You said you earned a mere $6K in 2016. So about $700-$800 of that was withheld from your paychecks by your employer and sent to the IRS on your behalf.
Now when you file your tax return, you *automatically* get to exclude the first $6,350 of your "earned' income from taxation, just because you breath. So all money withheld from all your paychecks received in 2017 will be refunded to you in full. The IRS isn't going to give you more back, than what you've paid in.
