Howdy, I am originally from Texas, but I have not lived inside the US Borders since July 2017, I have not filed any taxes for 2018/19 because I lived in AUS, is that ok?

[KarenJ2]

If you are a US citizen or green card holder you must file a US tax return every year no matter where you are living and working.

Usually US citizens or residents do not owe very much on their US tax returns due to the foreign earned income exclusion and foreign tax credits.  See        Tax Guide for US Citizens and Resident Aliens Abroad

TurboTax can help you with your prior year tax returns.  You will need the 2018 download software.  Your return will need to be mailed.  Prior year returns cannot be efiled.

To file a return for a prior tax year 

If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign,  and mail the return(s) 

File your 2018 , 2017 and 2016 Taxes