As people already explained, this is the default reaction when in the world of programing, just keep it going. As for the interviews, there are both scenarios, the ones where you simply are not yet fit for, and the ones where the company is going non-sense about it (and we see a lot of these...).
Nevertheless, just keep calm, accept that you are not going to master it all and keep your focus. If you see a job which you really like but don't feel confident about yourself when it comes to the requirements, apply to it, give it a try, get to know what companies are looking for and study to get your dream job (it's usually achievable, just keep it cool and keep going)
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As people already explained, this is the default reaction when in the world of programing, just keep it going. As for the interviews, there are both scenarios, the ones where you simply are not yet fit for, and the ones where the company is going non-sense about it (and we see a lot of these...).
Nevertheless, just keep calm, accept that you are not going to master it all and keep your focus. If you see a job which you really like but don't feel confident about yourself when it comes to the requirements, apply to it, give it a try, get to know what companies are looking for and study to get your dream job (it's usually achievable, just keep it cool and keep going)