I do not feel insecure in my competency as software/Firmware engineer but i started feeling really insecure about being an engineer , mostly because the way Society in general place us
usually it's like

surgeon > physician > Scientist (or any basic science person) > engineer

i didn't realise this before but recently i noticed and i stopped introducing myself as engineer to the people i meet either from my family or from dating apps. Here is the conversation that usually happens

Person: what do you do ?
Me: I build things
Person: so what do build ?
Me: My work involves building lot of things related to smart phone's wireless capabilities.
Person: oh so you manufacture phones ?
Me: No i work in connectivity part of it like bluetooth , wifi
Person: I don't understand, does it involve staring at computers all day (makes a face )
Me: yes 90% of it , I like building things making something new HW or SW and most of them do require a use of computer , even if I was a mechanical engineer computers would be necessary
Person: Hmm if i was not a surgeon i would be hair dresser , because i can't do anything that involves staring at computers all day.

same conversation happened multiple times.
no matter how good you are at writing code or how important task that code is performing , society consider's Software Engineering as a mundane task of " staring at screen "
if that song Remember the name is written for software engineers it will go like

This is ten percent luck
Twenty percent skill
Fifteen percent concentrated power of will
Five percent pleasure
Fifty percent pain
And a hundred percent reason to live in disdain