If you are on a J-1 visa, you will be exempt from the Substantial Presence Test for the first 2 (if non-student) or 5 (if student) calendar years that you are in the US. This means that you are considered a non-resident aliens for US tax purposes.
You will need to amend to aForm 1040NR to report your US source income. TurboTax does not support Form 1040NR. You may want to try https://www.sprintax.com/ which is specifically designed to help international student nonresident aliens with their US tax returns.
Here is a link to the IRS website for Form 1040NR, U.S. Nonresident Alien Income Tax Return . You will only need to report your US-source income on your 1040NR.
Click this link for more information from the IRS on US Tax Guide for Aliens
