It has never been better to be alive than today. The three main causes of death throughout history have been hunger, disease and war. Compared to 300 years ago we have a lot less wars, there is enough food for everyone (but distribution is still an issue) and we’re able to cure most diseases.
Animals need to rely on their basic instincts to survive. You could get eaten before breakfast. Food is scarce and getting injured is probably the end.
Our lizard brain is still used to this way of life. But we don’t have scarcity anymore, injuries can be healed and you won’t get eaten. Recognizing the feelings and urges of your lizard brain and letting them be for what they are is a great skill to master. It helps being emotionally stable, see the things how they really are and act with reason.