[I am being / you are being etc + adjective/noun] We can use this structure to talk about what people are/were doing, but not usually to say how they are/were feeling. Compare:
You're being stupid. ( = You're doing stupid things.) I was being very careful. (= I was doing something carefully.) I m happy just now. (not I'm being happy just now.) I was very depressed when you phoned. (NOT I was being very depressed . . .)