The thing to remember is, there are maybe 10+ possible reasons you didn't get an offer, and only one of them (doing badly in the interview) is under your contro

The thing to remember is, there are maybe 10+ possible reasons you didn't get an offer, and only one of them (doing badly in the interview) is under your control. The others (position got cut, somebody else was a better fit, internal requirements changed, position filled by an internal transfer, etc) are, if not random, at least indistinguishable from random from your perspective. Of course, they usually don't tell you the reason in your case, so all you can do is guess - if you think you bombed the interview then study what you missed, and if you don't, chalk it up to randomness.