I interviewed with Google last spring. My experience was different, but about as disappointing. I applied for a job, and received an out-of-the-blue email from a recruiter about a different job a couple months later (my resume must have landed in some "recent" bucket). The position was in Google Cloud. I was frustrated by the "you'll talk to a team after you've passed 100 hurdles" nonsense. I had one phone screen wit…
I also interviewed there last spring, but I thought it was super positive, even though I didn't get the job. I had to push myself really hard to get the onsite and I think that was beneficial to me. I have no computer science background at all and it forced me to prep intensively between interviews. So, I kind of went into it figuring I probably wouldn't get it but who knows and that it would just be good to have the experience of this super tough interview.
I learned some things! I started thinking about my job a bit differently, which is cool. Also, at the very least, the process made me better at interviews. Ha! There's always something you can take from a difficult experience (and it was for sure difficult.)
I don't think you should feel discouraged or feel bad about your abilities. It sounds like it was just a poor fit and you should be happy it didn't work out! Plus, now you've been through it once. You know what it's like. You can do it again somewhere else and it'll work out.
Good luck with Amazon!