The problem is Dark Energy is the majority of energy in the universe, by ~3x (very roughly, I of course forget the exact proportions).
That immediately excludes ALL energy given off by stars/etc, as not only is it way more than would ever be possible, but traditional energies would DECREASE the expansion rate, not accelerate it.
There is also the massive problem of how it appears: between galaxies. NOT within galaxies, but on a larger scale. If it were caused by stars, it would be concentrated around denser galaxies, not literally the opposite of that.
Nope. Wrong.
BOTH are not "real" things, as far as you describe. They BOTH describe phenomenon we have no precise explanations for.
Dark matter: Many (NOT all) galaxies rotate or otherwise act like they have a LOT more mass around them than we can observe. Mostly visible by further out objects rotating faster than they should. If there were only as much mass as we can see, outer objects should mostly be waaaay slower.
Dark energy: The furthest distances in the universe are accelerating away from us. That acceleration requires energy from somewhere. It does NOT happen within galaxies, but of course we can see millions of galaxies with the ultra-sensitive telescopes we have today.
In BOTH cases, we do not have a detailed explanation for, but we DO have MANY observations that confirm the effects. They are BOTH real phenomenon, and neither have solid explanations, yet. Hence the "dark xxx" names.