Go up with your instructor and practice stalls until you are completely comfortable with them. There is nothing to fear ! The examiner just wants to see you can recover from them safely.
Best stall experiences I had were stalling upside down at the top of a loop (and falling with style as I mucked up the recovery and ended up going earthwards with full power on and a laughing FI next to me) and stalling a Citation deliberately
...and hey I am not the bravest pilot in the world either, I used to be a bit wary of stalling until we did all manner of stalls .....accelerated stalls, turning stalls, etc....then I became comfortable doing that stuff.