Stay calm and move to safety. See a doctor immediately, even if you feel fine....

https://bizzmarkblog.com/how-to-handle-property-damage-vs-injury-claims-after-a-texas-car-crash/

Stay calm and move to safety. See a doctor immediately, even if you feel fine. Call the police for a report. Take photos and get witness info. Don’t admit fault or sign insurance papers early. Texas deadlines matter, so act quickly.