You can find the list of acceptable documents for proof of social security here:
https://www.dps.texas.gov/section/driver-license/texas-residency-requirement-driver-licenses-and-id-cards
Typically, this is a Social Security Card, 1099, W-2, or Paystub. The item must display your full name and Social Security Number.
If you do not have any of those documents, you can call your nearest Texas DPS office and ask them the best thing to do. The closest example is the Texas DPS – Aransas Pass, 919 S Commercial St, Aransas Pass, TX 78336, (361) 758-8680 · Mon–Fri, 8am–5pm. You can find your nearest DPS location here: