Demotivation and Nihilism I am curious as to how Buddhism deals with demotivation, in the sense of lacking goals and aspirations, and with nihilism, in the sense of feeling things are dissatisfactory and devoid of reasons to crave them.

I am aware the second aspect of my question is intimately tied with Buddhism, but I am somewhat asking: for someone lacking craving, what is there to be done in life? 

From the Mahayana point of view, I feel compassion is a noble aim, but I have trouble developping compassion. From the Theravada point of view, spiritual development is a goal, but without much obvious suffering to propel our spirituality we can get caught in cycles of lethargy, complacency. 

How does Buddhism deal with lack of motivation about mundane, every day things? What should one do in the worldly sense, when one isn't practicing?

Thank you.
This is what happens when you try to lead a monk life without leaving lay life.
Why not ask yourself the question "what am I doing in lay life if I'm not motivated to achieve the goals of lay life?"

This isn't the fault of Theravada Buddhism. It's the fault of the individual who cannot pick one lifestyle. Lethargy or laziness is one of the five hindrances and there's no place for it in Theravada Buddhism, whichever lifestyle you choose. 

If a certain goal does not interest you, stop bothering about it and work towards the goal that appeals to you. If no goal in lay life appeals to you, get ordained and practice diligently towards attaining enlightenment.