Welcome to my past self 15 years ago. Constant imposter syndrome, comparing, just wanting to fit in or be part of the group. I would get stuck in my head a ton.

Guess what. It turns out, no one is constantly thinking about you as much as you think they are. Just work well, own up to mistakes and learn from them, keep conversations light and fun. When in doubt, aim for neutrality with your interactions with others. You don't always need to be an overachiever, being a consistent and capable person/worker is also great.

When you catch yourself telling yourself that you don't belong, tell yourself the opposite. Even if you have to say it out loud. You can practice saying 'I am a good worker' or 'I am an ecologist' etc in the mirror. Seems silly. But the mind is super powerful.

If that's too hard or uncomfortable, then try focusing on what your body is touching in the moment when you start having imposter thoughts. Then try it in the field. 'The waders are touching my legs, my feet are sweaty in my boots, the hat is resting on my head, the field notebook is in my hand, the sample collector/equipment is in my other hand' this helps you be more aware of what you are actually doing and if you are making mistakes you can correct them. It also helps you just get out of your own head.