cappytan - That is Good, and you are Good. The reason that you feel the responsibility of Taking care of your family, and the reason you enjoy spending time with Nature, is You are Good. Simple as that.. You have always been Good, and you will always be Good.
As soon as you Fully Accept this fact, you will See Much more Good.
P.S. Not to out wikepedia you! = ) But another aspect of Nihilism is - "a philosophical doctrine that suggests the lack of belief in one or more reputedly meaningful aspects of life."