Does Energy really exists or is it just made up entity (like the quantum fields) to explain things which couldn’t be explained? For example: we can’t measure energy as it is, we always calculate the difference before and after the work done. Besides no one knows where it comes from! As it can’t be created or destroyed how does it begin to exist in the FIRST PLACE?
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There are some things that physics doesn't have an answer to at the moment. For example, why there is more matter than anti-matter. Why the masses of the particles have their values isn't known either - they are put in as parameters in the 'standard model' of particle physics.
It's also not known why the universe has its mass or why it has a certain number of particles.
Your question seems to fall into that category.
One thing that you might find interesting is that it could be argued that the total energy of the universe is zero.
For each mass $m$ the gravitational potential energy due to it, and its rest mass cancel
$$mc^2 - \frac{GMm}{R} = 0$$
Where $M$ and $R$ are the mass and radius of the universe respectively. Why this is approximately the case is known as the flatness problem, also connected to the 'Large Number Hypothesis' and is still the subject of debate.
John Hunter
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