I have no idea what you are other then a Human being, but here is what I can infer from what I've read, and experienced for myself.
I've read and I believe that everything in existence has it's own energy wave length of some kind, be it an Electromagnetic field like someone else hypothesized, or some thing more mysterious. I.E. A life force or "Creation Energy" that manifest in everything; Maybe you are a person who is on the same wave length as this energy, and this is why you can sense the energy emenating from rocks/ crystals, other people, and animals; which have no fear of you because you are on the same wave length as them and through this they can sense that your intentions to them are pure as you claim.

I've had some experiences that could tie in with or be similar to yours, more on that later if I decide to post it.