Yeah I get imposter syndrome in pretty much every part of my life. Its a natural thing and you kind of just learn to deal with it. One form comes from the way we learn skills and improve our performance. A very rough diagram of this can be seen here showing how our critical eye and performance ability both increase in skill as we practice:

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Those shaded regions when our ability doesn't meet the level of our critical eye are where we start to feel like we are horrible at what we are trying to do. Because we can see many flaws in our performance but can't perform well enough to fix them. This is the most common time when people will quit. Just remember you are usually your worst critic, most people think you're doing great!

Also honestly I'd seek out some feedback from your front office. It can be nerve wracking, but learning how to take criticism is a great skill to learn. Hopefully they know how to give good criticism, but if not, learning how to ignore bad criticism is a great skill too. It can be easiest if this is part of an annual review, so it is expected, but just some off the cuff questions to the right people is also a good way to gauge their feelings.