step 1. buy running shoes
step 2. buy socks
step 3. stop doing things barefoot

If you really need the feel for "barefoot" running, buy a pair of vibram five fingers. It's what they were designed for, and you don't ruin your feet.

It is the lack of shoes.

I dont think feet are meant for running on asphalt. Grass is ok, but asphalt is a hard surface so it will wear out your foot quite fast. This is also why runners need to replace their shoes. But if you do it enough your feet may grow fast enough, but you would probably get a lot of callous.

My god, and here I was thinking you couldn't get any more grotesque.

It is kinda silly of you to put your body through so much abuse and then be confused as to why...

Did you actually not know that exercising barefoot would do this to you?

No.
What logical reason is there to think that?

Barefoot is natural.
Exercise (mainly walking) is natural.

Why would the two together require a man made invention.

It may be natural.... but natural is not clean.

Natural is eating raw meat and not showering. Natural is stepping outside of your house and ****ting in the dirt. Natural is being diseased and knocked-up by the time you are sixteen. Natural is a lot of things, but it is usually neither clean nor healthy.

Humans began wearing footwear a long, long time ago. Our feet really aren't meant for rigorous barefoot exercise, as we've adapted to be both sedentary and dependent on technology.