I failed my first one and passed on my second, as well. It was the Corsa's fault... it has that stupid cuff you have to lift up and slip into reverse and sometimes you don't realise it's still in first and you accelerate and WHAM, you hit the curb! HAHAHAHA. I can laugh now, but I was traumatised when it happened.
Don't worry about things, and you're definitely not a loser. I have a co-worker who took his test three times before passing and his partner did the same thing. You can do it!