have a mind of one's own

verb2

1. •
   To form one's personal opinions and choose one's actions without being governed by the views or choices of others; to be independently minded; to think for oneself.

   • "Don't be anxious, daddy!" said he, with assumed playfulness; "she's not a girl to take the first that offers. She has a mind of her own." — 1866
2. •
   To seem to possess animate qualities or a conscious will, especially a will to misbehave.

   • This washing machine never sticks to the programmed cycle. It has a mind of its own.
   • I'm trying to follow the dance steps, but my feet have minds of their own.