Buddhism and Losing Determination

I noticed that I tend to very well know what I must do, and that I also strive and attempt to do these things, but that often I am filled with a kind of 'defeatism' or 'pessimism'. I know the right way, attempt the right way, but this heavy and saddening discouragement just makes me go: "What's the point? It's all futile anyways." **How would Buddhism describe and remedy such an emotion?** I feel like this is distinct from not knowing the right way, and not attempting the right way. It's more of a temporary emotion dragging me down, a kind of hopelessness or shame or maybe even self-hatred. This emotion doesn't always occur, but it occurs enough for me to be held back in my practice. **What should I do?**