What is your citizenship status? Are you a non-citizen?
TurboTax can only prepare a return for US citizens and "resident aliens for tax purposes". It cannot prepare a return for "non-resident aliens for tax purposes" who need Form 1040NR or 1040NR-EZ, which TurboTax cannot prepare.
I'll ask you some questions to help you determine how you are classified for tax purposes, and will then ask someone familiar with international filing to assist you.
What visa were you under during your stay in the USA? As for the "less than 6 months in 2017" was that the sole extent of your time in the USA, or were you also here prior to 2017? Are you here now?
