Flying for the first time since COVID

No, you don't.

The only thing you need for a domestic flight is a mask. You don't have to be vaccinated or have a negative test.

Travel tip - bring a bag of snacks, peanuts, chips, etc, and eat them very slowly one at a time. You can have your mask off/down while eating or drinking, so if you snack constantly and slowly, you can make it through most of your flight without the mask on. If that's something that interests you.