It's great that you're confident in your app and your strong internal locus of control has probably served you well. Your belief that if you didn't get an interview at HMS, you must have made a mistake is problematic though. This is not in your control, and you didn't necessarily make a mistake. There are limits to what you have power over. For instance, there are 7,000 other applicants, who, as we have all pointed out, also have high stats and interesting stories. Believing that you deserved an interview implies that you must be better than they are, which is also an issue. Confidence can easily become arrogance. We are here to become doctors. There will be plenty of times when you do everything right for a patient and it still goes to Hell. You can give that cancer patient all of the right dosages of the right therapeutics, and her cancer still grows, and you'll be sitting there wondering how that could happen when you did everything right. I wouldn't be here either if I didn't believe on some level that I can solve any problem, but, ****, there are forces in this world far more powerful than I am. You're going to have to get some perspective on what you do and do not have control over, while also learning to appreciate the talents of others, if you're going to survive emotionally in this field. So while I'm sorry that you are feeling frustrated and anxious, and that sucks, maybe you could take this as an opportunity to learn some humility. We're all going to soon enough.
I'm sorry I mommed you. Sometimes I can't help myself.