What Is ENERGY?

     I am first year high school student, i have studied energy, its different types, its transformation, its uses but still my mind doesn't get it ..... WHAT IS ENERGY? like what is it? i want to see it, is it an atom ....oh come on every thing is made up of atoms. Or is it an excited electron? I want to see energy in its original form. We say energy is the ability to do work , but what kind of ability? I don't understand this ability. This so-called ability is in   chemical, in sunlight, and even in our own bodies....... you lost me here. Okay even if you say that there are a few things around us which we cannot see, but still i want a reasonable answer.
    I asked the same very question from a chemistry and physics teacher, but i didn't got a really convincing answer...... so does any one out there know the answer to my question...... WHAT IS ENERGY?