"Be yourself" means "do not suppress your identity". It involves avoiding the trap of thinking e.g. that because your knowledge of Asian adult film stars is low-status, you should conceal it even at the cost of added stress.

That isn't what "be yourself" means. Furthermore, if that was what the phrase meant, "be yourself" would be terrible advice to listen to. I don't talk about Asian adult film stars in places where it is inappropriate because I have an "identify" of a) not being entirely socially incompetent and b) not being wilfully irrational and sabotaging myself. Adapting to the social environment one finds oneself in is not a weakness, it don't mean you have sacrificed your identity. It indicates that you are well rounded individual who is adaptable, self aware and comfortable. A strong identity doesn't need to prove itself in every conversation via counter-productive self-expression.

If you are playing status games, you don't want to be yourself- you want to be high status. If you are not playing status games, your status is irrelevant and you should act accordingly.

False. (See Villiam's explanation.)

Depression (a chemical state of the brain) is not laziness, nor lack of motivation, nor akrasia, nor lack of motivation. If you are referring to something other than a chemical state, try using 'melancholy'.

Misleading. While people's mental state's are based on chemical states and depressed individuals tend to have some differences in certain aspects of that chemical state, depression itself is not defined in terms of chemicals. In both theory and practice depression is a label based on a cluster of symptoms. So while lack of motivation does not constitute depression, lack of motivation combined with several other symptoms from the relevant group would.