I don't think my wife is my dream girl
What traits does your dream girl have?
I'd like to have a gentle and kind woman.
You shouldn't have expectations of your partner that they can't meet. It's better to communicate your needs honestly. If they can't be fulfilled you should choose another relationship.
I really want my wife to be a gentle and kind woman.
You cannot change your wife. You need to talk to her and tell her how you feel. If she changes on her own, then great.