If you want to be mentally healthy you should aim to be bored....
Bored, not with life but with yourself!
Every unhealthy person I have ever met is absolutely fascinated with their own neurosis- while every truly healthy person is fascinated with life.
You may argue that this is because unhealthy people have such large problems they must obsess upon them in order to 'deal' with them but everyone had a difficult childhood. The difference is that unhealthy people take refuge in their unhappiness. It is the most interesting thing in their lives.
Life is hard. We should accept this and take pleasure when we can.
Once we obsess upon what is wrong with us, we are lost. Suffering is natural- it is life that needs to be adjusted and not the individual!