I'm not sure I agree that presenting/using different parts of ourselves in different situations is really "playing a role," but I do understand what you mean. The important thing, as you say, is to be true to one's self, regardless of the situation.
"Playing a role" can have a benefit though - it can change habits and moods. Say you wake up every morning and sigh because life is boring and tedious. If you tell yourself "Today something good will happen!" and try to believe it, you'll present a positive face to the world and others will be positive towards you - which is what makes good things happen!
It feels like playing a role sometimes a work. As I feel I need to put a game face on which you could say is therefore a pretence. As such, our behaviours change a bit in different situations. I do agree on always trying to be positive and I do always put a positive face on.
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