How our brain is holding us back?

I recently finished reading Sapiens by Yuval Noah Harari. Its a fantastic read. Yuval has done a mammoth task of summarizing 70,000 years of history in 400 pages. While reading a book(or even by living in this era) you realize how fast our world has changed and continues to change. One thing is startling fact, which we all fail to realize is that brain is not keeping up that pace. It is still same from ancient times whose main objective was to survive. It also uses the same techniques on perceived danger situation, fight or flight. 

The brain that is constantly on look out of danger, sensing who/what could hurt/harm us. It is obviously evolved and dangers are now shifted from physical harm to emotional. 

Don't try that, you don't know how to and you could fail. People will laugh at you.

Don't ask, you could look like an idiot.

Don't quit your job. You will lose your social standing. 

Don't share your true feelings. You will be vulnerable, People could take advantage of you.

Don't speak your mind. It could cost you friends, relations. 

Don't do this or that. People don't do it or understand it. They won't like you.

See, none of this is actually leads to death. Its not closely related to 'survival' 

Real danger is brain trying to hold us back into our comfort zones(beings). Real danger is giving in to these alarms raised by brain. Real danger is to not trying that change, new thing you've always wanted to. Real danger is not taking risk. Real danger is always wanting to be comfortable. 

Give in, You've got this!