Talk with the college and explain your situation. I have a friend (not in TX though) who had a similar situation and he got residency based on the fact that he was in the process of getting a GC. Matter of fact he had filing for Asylum and he just showed the proof. I think you also have to meet other requirements. You have to be living in that state for over a year. The best thing to do is to discuss with the University. There should be a department which handles the residency tuition. Good Luck!

Laure_Boi