Ignoring our anger too well for too long can eventually make us feel that nothing matters at all. Professionals debate whether truly major depression is biological, psychological, or both. But everyone agrees that all depression, mild to severe, shows the need for better self-care. To the extent that this is true, it is a sad reflection of our guilt-ridden culture. It is not a reflection of some biological predisposition toward being depressed.
Any depression is a problem, and regularly occurring depression is a serious problem.
Here are the most concrete ideas I have for you. Just work your way down the list and spend as much time on each item as you need. Notice how prevalent anger is. Just go about your normal day and notice every time you see even the slightest sign of anger in the people around you. Notice how safe anger can be.