IF you were an undergraduate, and your parents normally claimed you as a dependent (at least until the year you dropped out...the probably did for all of 2018 anyhow)..then you file as an IL nonresident. You indicate on the My Info page that you were a TX resident all year. Undergraduate college students don't "move" they are a resident of their home state all year.
(...now for 2019 taxes, your parents may not be allowed to claim you as a dependent...even if you are living at home...depends on your 2019 income.....unless you go back to college in 2019)..
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*