Worried I over-sold myself in the interview for a massive jump in a job I just took, now realizing I'm way over my head and making mistakes. Anxiety is crippling.

Sorry if this post comes across as more of an anxious rant than an actual post looking for advice, but hear me out:

I'm a tech employee that's been working for the past 4 years in the tech industry, in two major jobs before this one. I left my last job for this new job and started on Monday. I was told this was a more "senior" position and I'm basically the top of the "food chain" for my position, with only one other designer working with me.

Now that I've started I'm starting to feel like I oversold myself and my abilities. I have absolutely no idea what I'm doing here.

It's a start-up with a lot of difficult problems to solve, and my first task officially started yesterday, and I put together my first solution/understanding today and had a 1:1 with my manager (the CEO) and they were... well they were underwhelmed with what I put together to say the last (it seemed, he didn't voice it specifically.) I was very clearly way off point with my solution.

I'm starting to really panic. This is a 20% pay bump for me, and I feel I 100% don't deserve it, and it's only a matter of time before they really figure that out. I'm starting to realize that during my career I never really learned proper "processes" and more so just went with the flow and perhaps just got really "lucky" with my output over the years.

I don't understand the company and its nuances and I feel like they're expecting I should, which is fair! I've been reading everything I can on internal documentation, taking diligent notes, and figuring everything out on my own (remotely is hard as well) and I just feel... like a failure, like I don't get it at all.

How do you truly know you've oversold yourself VS imposter syndrome? What can I do in my situation to either improve myself, or do I just quit at this point and apologize so they can find an appropriate person to work in my position that deserves it?

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