That's a myth or at least very uncommon. Mexican food and chicken fried steak is pretty common in Texas. Depending on the town, you might find some decent German food, but since you're from DE, you're probably not going to be too interested in that. There are some beautiful areas to visit between Austin and San Antonio in what we call the "Hill Country," but other than a few pockets in Austin (due to the university) and Houston, Texas is a cultural wasteland.
Austin is a blast, though. It's my favorite place to be in the US.