That word - solid. No. I mean, not any more solid than hard vacuum.
Out in interstellar space, you can get densities of normal matter about 1 atom per cubic centimeter. Somewhat lower out between the spiral arms of the galaxy. This is "hard vacuum" - not "solid".
The density of dark matter in our region of space is calculated to be roughly 1 proton mass per three cubic centimeters. So, the density of dark matter is less than a third of that of normal matter in the void. What it misses in density around us, it makes up for in sheer volume.
The exact same things were said about neutrinos. They don't obstruct light or other emitted energy in any way. They are very light, but there's *lots* of them. Like 500 million per cubic meter around us. They are sleeting through the Earth, through your very flesh. They were first detected in the wild in 1965, a decade after one had been created and detected in the lab.
Patience, dude. This stuff doesn't just come, fully formed from the forehead of Zeus, or something. Science takes *time*.