You were having an off day. We all have them.
And if you were feeling that you couldn't cope in your test, then you made a good call in airmanship terms by calling the test off. I had to call of the Nav part of the test because of unforeseen low cloud and I can assure the others out there that it takes far more bottle to call off either the whole test or part of it, than it does to continue to struggle through. SAFETY FIRST.
You'll get there and wonder what all the fuss was about!!
But if your instructor is making comments like that..... get rid!!
Good luck.