I have about 8 years experience in the industry. In the beginner of my career I did feel a bit of the impostor syndrome. Quite frankly, it was because I had this ideal of what a programmer ( or whatever buzz word title) should be. As I got on with my career I slowly realized no-body gives a shit. Its just HR that give those titles.
I also found that I accepted the fact that I will just not know everything. I will never tick all the boxes of what a job may require...
So moving forward to now. I don't care at all for titles. I just want to code and I want to TRY write some good code. I compare myself to nobody else and just talk and learn from everybody. I have learned equally from a juniors as I have from a senior developers.
I continue to chug along with the mindset that I am a crappy developer. Therefore always interested in learning and always open to whatever somebody else has to add. I will never be the smartest programmer or the best programmer. That's ok because I will learn more from the programmers that are.
I'm just enjoying the ride.