Attitude of Gratitude
This comes from a primitive part of our brain developed to keep us aware of danger at all times. It is possible to overcome this bias, however, by training ourselves to override it. It is certainly worth the effort as we are more likely to feel happier & be more resilient if we do.
One way to do this is to become more aware of what we are grateful for & focussing on what we have rather than what we haven't got in our lives. This is a really powerful habit to get into and can help shift that negativity bias. It won't happen immediately though, repetition & persistence is needed to build a habit. Start by listing a few things every day that you are grateful for and focus on them for a few minutes. If you do this regularly it will start to alter your perspective.
Create yourself an attitude of gratitude :)