I would be without so much information that the only thing I could use to problem solve with was my imagination.
I would think I had a soul in my body that was operating my experience. I would think that special powerful humans controlled the weather and when the sun rose and set. I would think by talking out loud to those powerful humans I could persuade them to do things in my favor to make my experience more enjoyable..
The things I would know for a fact would be that members in my tribe sometimes would "shut off" and not ever be responsive anymore. I would then use the only means of obtaining information (my imagination) and conclude those unresponsive people go on to a new experience that was controlled by super humans that ultimately controlled EVERYTHING.