>>33347740 (OP)It's not a failure. Failure implies attempting a type of work, or task, and failing at it. You cannot fail an interview because you aren't doing work, you are being interviewed to be accepted into the work. So how could you have failed if you didn't even get the work in order to fail? You didn't fail. You simply did not get the job, that's all.
Why? Loads of reasons. But the biggest reason most jobs pass on you at an interview is because of reasons that don't even have anything to do with you, at all.
9/10 times it's because someone else interviewed showed up and had more experience at the type of work than you did. Doesn't matter if you had an amazing interview, doesn't matter if the interviewers liked you as a person. What matters is money. And they always pick who they feel is the most qualified or suitable for the specific job role.
Doesn't mean you suck or failed. It means the job interviewers made a choice that wasn't (you). And it may not even be the best choice for them who knows.
I interviewed for a job, had an amazing interview, got a long great with the managers. Even gave me a trial day of work to see how I like it. I performed well and had a blast. In the end I didn't get the job. Why? Some woman showed up, she used to manage the exact same kind of store. They picked her. Didn't work out too well for them in the end as she eventually caused drama and had mental issues.