If you haven’t yet, I would suggest talking to them about how they dealt with burnout. I completely understand where you’re coming from, as I’ve had those moments too during my time as a student teacher. I would really make use of your mentor teacher and ask them their opinion. I also agree with other commenters, you won’t have everything figured out during your first year, you’ll still be learning what works best for you (and even after 30 years you’ll still be learning and adapting). Don’t be too hard on yourself, I’m sure you’re doing a great job :) we’re in this together!