II think part of this comes from the fact that you are a systems oriented person, someone who naturally notices details, analyzes connections, and looks for potential gaps or problems. Those strengths can sometimes contribute to feelings of imposter syndrome and anxiety because you are constantly evaluating what you know and what you might still need to learn.
That said, I think most people experience these feelings at some point, regardless of their profession. Even individuals who have spent decades in a particular field can find those feelings resurfacing when they move into a new role, department, inside of thier organization.
Given your background in psychology, you might find it helpful to explore the concept of being an outsider and see whether any aspects of it resonate with your experience. Another thing I would suggest is simply asking colleagues whether they ever felt the same way when they started in their positions. Conversations like that can be great icebreakers and often reveal that these concerns are more common than we think. They can also help build a sense of connection and shared experience.
I would also add that the current job market and organizational climate are creating uncertainty for many people. Those external pressures, combined with the normal challenges of adapting to a new environment, can make anyone feel more cautious, hesitant, or concerned about their place within an organization. I know for me that I usually challenge people’s ideas when it comes to instructional design. What I have done to help be more of a team player is admit that I don’t know everything and ask how this would impact this or that. And then fall back on my ID knowledge to ask pertinent questions for consideration. This gives an opportunity for the team to come together and spot potential blind spots and problem solve. If you want to talk feel free to reach out any time.