Is this linked to my self esteem?

I work in the hospital as a CNA, I’m quiet and introverted. I’ve been here a year, and I feel like the nurses can be bossy sometimes. I just ignore it or let it roll off my shoulders. Now I started saying “I’ll try to get to it” I keep myself busy but my one coworker thinks I’m overworking myself and that I need to say “no” lol.

I want to be assertive. These nurses are my age but are so smart, their common sense is on point, they are very mature and they are younger than me. What are some things I could do or say when they get a little bossy? I’d never let someone be rude, and I told a nurse that and she’s like “you would?” Lmao

I don’t want them thinking I don’t know how to stick up for myself. But I don't know if I’m overthinking it cause of my self esteem.
Is this linked to my self esteem?
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