in my mind 在我心里(不是in my heart)
In your mind, you feel like a child.在你心里,你还觉得自己是个孩子。
a change of heart 改变主意
I've had a change of heart. 我已经改变主意了。
take something to heart 往心里去
Don't take this to heart, but I think...别往心里去,别伤心,但我想。。。
pour one's heart out 把心打开;敞开心扉
one's heart is not in something 心没在某事上
Put your heart into it.用心做这件事