Have you asserted or waived your rights? You may have the right to consult an attorney.

I certainly have no agreement with the Texas police or any government through which I could have waived any rights.

You can certainly do so, such as waiving the right to a jury trial.

Yes. People can waive a trial altogether, even a trial by judge. It has to be done in front of a judge, and is limited to that trial for that person.

High certainty statement, where did you get that from?