Ok, I'll help you with this. Just because you asked nicely.
First and foremost, you weren't ready to take the test. Don't be insulted by that, because it's not an insult. You're too timid and nervous still, and you need more time to build up some confidence. Driving 20 km'h under the posted limit means you're too scared to drive with normal traffic. That's OK, you'll get more confident as time goes on.
Second, congratulations on not passing your first time. No really, I mean that. Some of the finest people I've ever known did not pass their driving tests on the first try. That includes my sister, my brother, my brother in-law, two co-workers (both respected professionals in their fields), my god-daughter, and my old driving instructor. You're in really good company. Did I mention that many people I respect and admire failed their first driving test? True story! Almost makes me wish I had failed my first time.
You know what, that driving examiner was a douche bag. I wouldn't have passed you either (sorry, but I wouldn't), but I would have had the decency to tell you that all you need is a little more time and practice to pass. And I would have been right, because all you need it more time and practice.
Take this not as a failure, but as an opportunity. Spend a little more time on the road, sharpen your skills and build your confidence, then take the test again. You won't just beat the minimum score next time, you'll beat it and make it say uncle. And when you pass the second time around (and you will, I promise), remember that you're just like many of the most respected people on the entire planet when you do.