"We've had quite a long stretch of recorded history and as far as I can see we have not changed."
Sure we have.
"We have not grown wings to fly or gill to swim the seas or even coats of fur to protect us from the harsh winters."
Why would we?
". Our feet are so tender we have to wear shoes if left to ourselves from birth we would die."
All mammals would die if left to themselves after birth. Why should this have changed with us?
" So where is the proof that we are changing into some higher life form?"
Who said higher? Or lower? What does that even mean?
Would you not say that man is a higher life form than the ape that we came from? Where is the proof of our physical adaptation to our environment?