This can't be uncommon.
When I was a developer, I either felt like what I was doing could be done by a smart highschooler (probably better than I was doing it) because it was straight forward, or like I was figuring things out as I went along (because it was hard).
Now I do less development and more business analysis / architecture, I feel like I'm talking to a lot of far smarter people, and probably look smarter than I am because I'm echoing better informed peoples opinions back and forth.
All I could advise someone starting out in tech is to remember that no one really knows what they are doing.