Is deodorant necessary for me?

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I'm a 25yo woman. I don't have armpit hair and if the ocassional hair decides to pop out, I pull it and that's it. I only had armpit odour when I was 15 years old, but apart from those weeks, I haven't had any. That said, I've been wondering: is deodorant necessary for me? Asking because someone I talk to often through chat (but never see in person) insists I should (even though my family agrees I don't need it).