have a mind of your own
US /hæv ə maɪnd əv jʊər oʊn/
UK /hæv ə maɪnd əv jʊər oʊn/

1.
自分の意見を持つ, 自分の考えを持つ
to be able to make your own decisions and form your own opinions, rather than just agreeing with others
:
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She always has a mind of her own and won't be easily swayed by peer pressure.
彼女はいつも自分の意見を持っていて、同調圧力に簡単に流されることはない。
•
It's important for children to learn to have a mind of their own.
子供たちが自分の意見を持つことを学ぶのは重要だ。