Sorry to hear that - fingers crossed for your next test.
It's so hard to pass the test - it took both me and my brother 3 attempts each to pass ours - and I do wonder if they deliberately fail you on silly things sometimes. They claim there's no quota, but there were always rumours flying around when I was learning to drive about how they had to fail a certain number of people a day (since the pass rate is only 45% on average).
I failed on silly things as well... my second test, I only got 2 minors, but because I didn't come to a complete stop at a Stop Sign (I came to an almost-stop) it was an automatic fail! When I finished the test thinking it had gone really well, the examiner turned to me and said "You know you failed in the first 5 minutes, don't you?".
My brother failed his test for slowing down and letting a cyclist go first past an island in the middle of the road. He didn't think he would fit as well and didn't want to hit the cyclist, so thought the safest thing to do would be to hang back. He failed for it.