Yep, you're not the only one who feels that way. Röntgen, the person who
discovered x-rays, was intrigued that x-rays could partially pass through
But how does it happen? I never felt the x-rays inside of me.
That's why Röntgen called them x-rays, because he didn't know what was
going on or why. "X" is a way of labeling something as mysterious.
Right, only now we know better. X-rays are high-energy photons, just like
ordinary visible light, except with more energy and a shorter wavelength.
That's because they are "too thick". Try this experiment. I'll give you a
souped-up flashlight that can emit any frequency (or color) of light including
x-rays. Shine it on a chunk of matter and see what comes out the other side.
Only the x-rays pass through, but you didn't say why.
Photons can pass through a substantial thickness of matter only if they have
high enough energies.