Barefoot running changes your stride. You run with a mid foot strike instead of a heel strike. You can hit the ground just as fast like this since you use your whole foot as a spring instead of relying on your knees and the heel of your shoe. The biggest difference in barefoot running is how short your strides will be but you run the same speed. After you’ve built up callouses on your feet that is. That part sucks.
You can connect a usb cd drive to android. Probably depends on your phone and you might need some adapter but android is pretty robust that way. I don’t know what apps they could use to rip music from cd on android though.