I'm not ready when my mum asked
What is your reason for not being ready?
I'm a rational person and I don't want to be treated that way
You should obey your parents. It's rude not to be respectful toward them.
No, I don't want to do the things they chose for me.
Your parents want what is best for you. If they are asking you to do something then you ought to do your best to respect their wishes.