You also have to start not giving a shit if you don't get the role
Why do I say that? Because I suffer from anxiety and hate interviews. I'm shit in interviews. One I went for I was just desperate to get out of the NHS. Turned out both managers that interviewed me were really nice.
Long story short. Once I'd been in a year was talking to one of them when they were looking for IT manager replacement. One of the applicants walked out after being told there was a short test. She said "What they don't realise is we don't solely take into account the test, we look to see if they'll fit the team as well". I did suggest some people just panic so maybe that's why he walked.
Also over the years I've seen people get roles they shouldn't have. I've seen an engineer get a role at the NHS only for HR to state "That's not policy or potentially legal. You have to put it out for interviews" so they did. Wasted everyone's time that applied because they were going to fudge the results so they could just choose the engineer they'd already given the role to. Interviews were only done to shut HR up. So sometimes, its not because you were bad in the interview, its because they either already have someone in mind and just going through the ropes or they are scamming the system to get rid of you so they can replace you with someone cheaper.
I had the unfortunate job of checking over CVs at one job. I was only an engineer but the place was desperate, they'd fired the shit IT manager with no replacement so I had to help out in some areas, one was just checking over CVs. Because they were bringing in a temp engineer and the head of IT was mainly an accountant and not IT (although still a really nice person). When I was looking them all over I felt really guilty while reading them thinking "You're a chef, not choosing you. You have no experience, not choosing you". I asked her after how she copes. Told her about my anxiety and how I hate applying for jobs because always feel no one is going to give me a chance. She just said "You get used to it and learn to ignore the emotions, its not personal".