Galilean Relativity: An Inertial Framework

Galilean Relativity is an idea from physics that you can never truly grasp, understand, or define a system that you're a part of. In our everyday lives, we're spinning at tens of thousands of miles per hour being on Earth, but we can't feel that in any noticeable way in our day to day lives. One way that this could apply to our lives is thinking about a system as different ages. If I look back at myself when I'm 20, I see all the stupid mistakes that I made. And it's so clear to me now because I'm not part of that system anymore. But 20 year old bloss at the same time, it was not clear to me