Welcome to Texas Gardening! Could we have been separated at birth??? I can grow most plants, but vegetables are mystifying and frustrating for me. I'm sure someone will come in here and tel you what you need to know to successfully
grow tomatoes. Me? I bought some patio tomato plants from the FFA club at one of the high schools. We're on limestone, and I've given up on having a veggie garden in the ground. I buy a truck load of compost every spring. I think it just seeps into the limestone crevices every summer!
How about trying raised beds? Maybe just one to start with.