Answer:
Travel a mile and I will change, travel a million and I will end as I started. What am I?
Flat as a leaf round as a ring. I have two eyes but can't see a thing.
You do not want me when you donβt have me, but when you have me you donβt want to lose me.
If you lose me, you may cause people around you to lose me too. What am I?
What is the beginning of eternity the end of time and space the beginning of every end and the end of every race?
No matter how little or how much you use me, you change me every month.