Schottky diodes question for circuit

I have been working with my circuit a bit. See attached. The resistance in the pic is the actual resister readings. My issue is the line with 3.17volts in real life is showing 1.688volts. I know the program i have in the picture is perfect world but that is way lower then i thought it should be. If i take out the zenier diode i get 3. volts. So its keeping it from going over 3.3v but why is it keeping it so low and not around that 3.17volts? Sorry i am not an expert just a hobbyists working on a fun project.

The resister that is 9.78k will be a water temp thermister(i think its called) that will have a range from 115 Ohms to Ohms. I dont need the higher Ohms which will be very cold temps. My real world range i want to use is around 110 Ohms to Ohms (hints my 9.7k resister to test my protection circuit) . That being said if we get a really cold unusually cold winter it could drop the temp so the thermister gives me a voltage over 3.3v taking out the esp32 chip.

Thanks you all have been very helpful. I am learning a lot!!

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I am new to electrical engineering and I would be very grateful if someone could look over my schematic and tell me if something is wrong or could be done better. In my schematic I have a XT60-M ...

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