你好像误会我的意思了。
Nǐ hǎoxiàng wùhuì wǒ de yìsi le.
It seems like you mistook my meaning.
我不明白你的意思。
Wǒ bù míngbai nǐ de yìsi.
I don't understand your meaning.
我的意思是我不介意。
Wǒ de yìsi shì wǒ bù jièyì.
My meaning is that I don't mind.