I've been in my field for 21 years. I make really good money, and have high confidence in my hard-earned skillset. I focus on Cloud Infrastructure and general Linux administration, but I code in a handful of languages to facilitate automation (because I'm lazy). I consider myself extremely well versed in technology in general.

... Then I watch a YouTube video where some guy hand-solders a motherboard for his custom-designed keyboard, and decides it's easier to - instead of adapt someone else's - write his own driver from scratch, then open-sources everything from the PCB, to the CAD files he used to print the case, to the driver itself. Then he uploads the video, titled "Quick weekend project because I couldn't find the keyboard layout I wanted on Amazon", and forgets about the whole thing.

In that moment, I feel like a complete, no-nothing idiot.

A person with a doctorate in astrophysics isn't not-a-doctor because they don't know how to do brain surgery. Hell, a doctor who is a surgeon isn't not-those-things because he isn't - specifically - a brain surgeon.

Don't sell yourself short because other people do things you don't (yet, or even ever). You're a technical person.

It depends heavily on what you do and what you're comparing yourself against. I've been making a living with IT for nearly 20 years and I still don't consider myself to be an expert on anything, but it's a really wide field and what I've learned that the things I consider 'easy' or 'simple' (mostly with linux servers) are surprisingly difficult for people who'd (for example) wipe the floor with me if we competed on planning and setting up an server infrastructure or build enterprise networks.

And of course I've also met the other end of spectrum. People who claim to be 'experts' or 'senior techs' at something are so incompetent on their tasks or their field of knowledge is so ridiculously narrow that I wouldn't trust them with anything above first tier helpdesk if even that. And the sad part is that those 'experts' often make way more money than me because they happened to score a job on some big IT company and their hours are billed accordingly.

And then there's the whole other can of worms on a forums like this where 'technical people' range from someone who can install a operating system by following instructions to the guys who write assembly code to some obscure old hardware just for the fun of it.