Ideally someone has already beaten you to the punch(Imposter Syndrome is literally item #1 when I take on engineers to mentor). Of my sample size of ~150 engineers across every level my success rate of having people say "Oh my god, I have that" is so far 100%.
More concretely though I would not look to anyone directly in your management chain for a variety of reasons. The best ways I've seen to address it is with a senior engineer or someone that you respect who's willing to take you on in a mentorship role. This should be something where you set aside time to talk through these types of issues(plus all the other wonderful inter-team stuff that comes up in development) over a 3-6mo period.
If you can't find that I will say this: I've found that it comes from a place of caring and giving a shit about wanting to carry your weight or be a part of something. I don't think it's possible to have a desire to improve yourself and not experience it on a regular basis.
The best way I've found to approach it is to recognize when it's happening, call it out directly and tell yourself that your brain is being an asshole in this specific instance. Something I've also seen work well for other people is to do a short list of the things that you work on each day. Review it at the end of the day and take an objective look at what you've accomplished, you'll often find that it's more than you 'felt' like you did.
Hope that gives you some direction. If you're finding you local resources lacking drop me a line at val at vvanders.com and see what I can do to help.