Can you get your license without having a car or insurance going under any others policy just stricktly in the state of Texas age 18?

No, in order to obtain a driver's license in Texas at the age of 18, you will need to provide proof of insurance. This can be done by showing an insurance card or binder that lists you as the insured driver on a vehicle. If you do not have access to a car or insurance policy under your own name, you can still obtain a driver's license by adding yourself as an occasional driver to someone else's policy. In this case, you would need to provide a copy of the insurance card or binder for the vehicle that you will be driving. Additionally, you will need to provide a letter from the insurance company stating that you are an occasional driver on the policy.