Why am I not retaining info from my math movie?

I signed our two adult math videos from the library and I’m resistant and embarrassed to learning about pi. Is this normal? I feel like I should learn this, but I don’t really care. I watched the first chapter. Or should I skip a few chapters to get to the good stuff? I have a high school diploma. The movie name is Mathematica PBS 2012. I got the jist of it. I didn’t get pi from spheres and cones. Should I watch it over and over until I get it?