It's very good statement to think about. But I'd like to turn it to the other side - "life is fighting with YOURSELF".
Are you strong enough to use all the opportunities? Many people are frightened of doing great things and don't believe in themselves even when others do. Are you open enough not to hide your problems inside, but try to solve them?
I suppose lots of people are fighting with each other not for better place under the sun, but not to do really significant events. It's better stay unsuccessful because of smbd's luck, but not because of your own standstill.
Life is not easy but a ¨fight¨ is not the healthiest metaphor to describe it. The way you are feeling today has recently been called ¨the scarcity mindset¨ by psychologists. It is based on fear and is understandable but not the healthiest way to look at life.
I encourage you to read more about the scarcity mindset-- searching for that in Google. Brené Brown writes very eloquently about it in her book about vulnerability. Here is a good starting point https://potentiatherapy.com/2017/01/a-different-perspective-on-scarcity-mindset-and-responding-to-a-culture-of-never-enough/
I do not deny that people compete for power and resources and this is one of the negative, unhealthy parts of the world. Think it over more before you give in to this mindset and accept it as your guide for life.