OMG did your instructor not tak eyou through the laws of the road?
I know that it is difficult not to 'keep up with everyone else' but I guess it is true what they say, you learn to drive after you have passed your test and I think that this will be your first lesson however hard it seems.
Having only been caught speeding once in over twenty years of driving, I guess that I am either very lucky, know how to avoid or maybe sensible enough to look out for the signs of a speed trap.
Hope it all works out for you but as New Judge mentioned, prepare to have to take the tests over again.