How to not fail interviews in Kathmandu Valley?

Getting jobs in kathmandu specially after you've few years of experience is tough because there are too less jobs. And on top of that, I got around 5 opportunities and failed each of the interviews in the past 1 year. Believe me, 5 interviews in <1 year is a "LOT" of interviews in Kathmandu valley.

My problems:

- Confidence

- Anxiety(I am on therapy since 2 years but still haven't practiced JPMR that much)

- Then I reply in such a way that sounds offensive to the other person. For example: I don't know Networks. Then when someone ask me "You've not worked with networks earlier, are you able to work with them". My immediate response was "Yes that's not a big deal" LOL.

Another question was "Have you worked with postgresql, we only see mysql experience". I told "Both are similar, if you know one database, it's easy to transition between two".

I just violated the interviewers lol. I am least likable person everywhere I've been to..I just want to learn the soft skills.