Am I a bad employee for not greeting my co workers good morning/evening everyday?

Anonymous
I just started a job at hospital as an admin assistant and one of my co workers told me she noticed I dont greet my co workers good morning or good evening she said Im still under observation and its make me feel anxious because maybe I will lose my job over that. by the way Im extremely introverted and Im very shy to say that. Sometimes I say goodbye to them when leaving but they dont seem to hear me because my voice is too weak. But Im anxious again that I maybe lose job over that.
Am I a bad employee for not greeting my co workers good morning/evening everyday?
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