FWIW, I felt so many of these feelings last year as someone who applied to 18 sites and received 4 interviews. This is only one interview shy of the "5-8" that was average. But I felt like a failure a lot of the time. I was at a prac site with two peers who had more hours and more focused sense of what what they wanted. They each received over 10 interviews. Over twice what I got. I'll be honest, I spiraled into a dark pit of self-comparison and (at times) resentment. It affected how much I could rely on them for support and it served only to make me feel like crap. Like, for real, I was miserable. But while they were worried about the uncertainty of matching, I was worried I wasn't good enough. I thought I knew they were better than I was. I struggle with some serious imposter syndrome, clearly.
I know it can be challenging when people have so much and it may seem like they don't see the "real" picture. It may seem like they are worried for no reason. They'll match, after all. But I encourage you all to consider what you're really being triggered by here. When you have 2 interviews and someone is worried with 10, what are you really feeling? I'd bet it isn't mad at them for getting 10 interviews. The truth is we don't know anything about their internal and external struggle. Maybe they are a more competitive applicant, and maybe they aren't. But what does that really mean? This process is pretty arbitrary and imperfect. They could have more hours, recommendation writers with better writing skills, maybe they had essays that were a bit more cohesive than yours. Their program has a better reputation. The list goes on and on.
It can be so hard to remember that feelings are still feelings. And we all get them.
I promise that in a few months, no matter what happens, you will be looking forward to the future (whatever and wherever that may be), and you'll be planning for that. It sounds silly, but try to focus on what the future holds for you (an entire career!) and not questioning yourself. You're the only one who loses.