“Perfectionism is not the same thing as striving to be your best. Perfectionism is the belief that if we live perfect, look perfect, and act perfect, we can minimize or avoid the pain of blame, judgement, and shame. It’s a shield. It’s a twenty-ton shield that we lug around thinking it will protect us when, in fact, it’s the thing that’s really preventing us from flight.”
You feel less like an imposter when you realise that nobody is perfect. You can embrace your imperfections and be satisfied with who you are today.
As a side note, this "Ask HN" question is one of the many reason I enjoy reading HN. It's a vulnerable question that has provoked several honest and thoughtful answers. It's not a "Top 10 way to overcome imposter syndrome" blog post...there's no link baiting or profit to be made. I suspect that asking the question will go along way to making the OP feel a lot better...it's tough to feel like an imposter when the response from the community is so positive.