Would I get accepted into the University of Texas in Austin?

Go ahead and take the SAT and ACT as many times as you can and try to score in the 27-30 range at least. Your GPA is pretty good, just don't let it get too much lower. Your ECs are also good, so as long as you keep doing what you're doing and do well on those standardized tests, you should be good to go. Also, take the most rigorous courses you can. The majority of accepted students at schools like UTA take the toughest classes their schools have to offer.