Dream figures try to stop me. Why?

I´m pretty new to lucid dreaming, but have had enough experiences now to see the value of setting up a dreaming task for when I´m lucid beforehand. The task I have set has to do with what´s real, and if "physical" and dream worlds intersect: "Find something in the dream that you can check upon waking that will prove that dreams are real." I read somewhere about a lady who had an out of body experience (OBE) and saw a shoe on the roof, could describe it accurately afterwards, and it turned out to really be there.

In my last two lucid dreams I have searched very enthusiastically for things that would accomplish this. 2 insights so far:

1. I will always think that the place/item I have found has an equivalent in the physical world, but upon waking I realise that it hasn´t, at least not that I´m aware of. Sometimes close, but most often totally unfamiliar to me.

2. Someone will always try to stop me from finding this proof. I might be memorizing something for later checks and someone will try to distract me, or I will place something somewhere that I plan to find when awake, and someone turns up with a knife. These figures are silent, but their intentions are clear to me in the dream.

I´m thinking now my task is futile, and that I would better use my experiences for something more constructive. Still, I would appreciate any comments on this task, and on the figures that seem determined to hinder me. Who are they?

Your subconscious might be trying to keep you from being lucid. I'm not sure if subconsciousnessesesesesesesessssss...
do that or not. Generally in a dream I accept it as reality and kind of follow some sort of story that I'm not entirely clued into. That might be why you think it is futile.

Otherwise, now that you have said that is what they "always" do, you will expect them to, thus they do.