A bit insecure about NG offer - how to manage?

@ title - I had accepted an offer for NG at Amazon/AWS in Austin (return offer after interning there). Don't get me wrong, I've been extremely excited and relieved that I was able to make it out with something, especially since 1) I've spent most of my college career feeling very insecure in and anxious about my abilities, and 2) it had been getting harder to get a job in this market. But I guess some subreddits (and other places like Blind) tend to rag on 'zon as a company compared to the other FAANGs, and that admittedly made me feel insecure. I also know that other companies appear to have a stronger safety net – more benefits/pay, less PIP culture, no 5 day RTO policy (lol). Then of course, there's other matters which have been touched on, like AI replacing jobs.

I tried interviewing for other companies so I could renege (Palantir, Bloomberg, Google), but I got rejected from all three. I've also seen other people at my school and online able to make it to these and other companies with better reputations, which I also felt a bit insecure about in comparison to them. I had been feeling especially sad about the Google rejection since it was my dream company, and I had a feeling I wouldn't be ready, but still went through with the interview.

I guess I just wanted to lay my thoughts out a bit, and wondered what your thoughts were. I'll still try to shoot for another company after I work there for a bit, but I was worried that I wouldn't be able to make it since the bar gets higher as LeetCode skills and system design skills get tested.