“Plasticity” is the term neurologists use to describe the brain’s ability to change. Your brain grows new connections as you learn new skills. The change is gradual, as your brain cells develop new connections to speed the efficiency of new skills acquired.
So, since you brain can change, make it work in a positive direction with an emotional circuit that is optimistic, rather than pessimistic. Not only does complaining bring negativity to you, it can be downright depressing. Gossiping, watching too much news exposes you to imagine or anticipatory fear, violence and hate elevate your cortisol levels, causing a multitude of physical and emotional problems. Stay clear of negative or toxic people, thoughts and activities to created more resilience within. Since your brain is "plastic" guide it to take you to better places, people and experiences. Remember, the the body follows the mind, to take yourself to loving kindness, being present, grounded and targeting happiness.