It's a huge struggle for me and several of my co workers as well. It's a huge problem for our industry in general (cyber security) but the main way I deal with it is asking the questions and getting help when I need it, that's how you realize the people who you think are so much better at what you do than you are actually pretty similar and working it out together shows you that your thought process may have been on the right track, but lacking insight, or just lacking experience, both of which come in time.

Idk about .ost industries but in my position (penetration testing) being able to fool people is a good skill for the job so the way my boss put it is, "look I hired you because I saw the confidence and potential to do this job and do it well. I've only made 2 mistakes when hiring employees, and when you consider the nber I've hired that's an impressive track record, so if you are an imposter than you were good enough to fool me... Which means you are good at this job.