Fell of a motorcycle, is that a common thing?

Alright. I want to get my drivers licence for motorcycles, and I haven't really ridden anything powerful before. But in my country, I'm required to spend at least 33 hours out on the streets, in traffic followed by my instructor in a car. (Of course, not all hours at once.). The motorbike I have to ride is a Honda CBR500. I've spent 2 hours in a parking lot. Getting used to the clutch, accelerating, doing figure 8's etc. I had no trouble whatsoever. However, today out on the streets, I fell within the first 10 minutes (later on it was ok). I was about to take a turn, I was going really slowly, and before I got to the stop line, the light changed to red, I panic braked and fell of the bike. Luckily I have some odd reflexes and I jumped off of it and landed on my feet… I think the law in my country is a bit stupid. You are free to drive 49cc bikes without a licence. You can get a licence to drive 125cc or 600cc bikes and of course the no restriction one. However, if you're going for the 600cc one. You MUST practice and pass the test on a bike that's on the upper limits. So even though I have ridden motorcycles for a year or so, mainly Yamaha YBR 125. My skills are pretty much useless. I wasn't worried before, but now I'm starting to be… Could you guys give me some advice? It'd be really helpful.

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