Dark matter may not exist, in fact many observations conflict with our dark matter models. IMO I just think our understanding of physics is incomplete.
Only 5% of all matter is "regular" matter, and ~27% is dark matter which makes it be 85% of all mass but not of mass-energy since there is ~68% of dark energy.
It's the combination of dark matter + dark energy that makes for ~95% of the universe's total mass-energy.
