Then you should look for micro-successes, and build upon them by ensuring they occur more. The goal here is to accumulate a momentum of success that spawns motivation, and avoid measuring success from an absolute perspective (e.g., small victories matter).

Honestly though, it sounds like maybe you're trapped in a lifestyle that may genuinely (rationally) not be worth it for you. The only way to solve it may be to fundamentally alter your lifestyle toward greater self-interest (not the same as selfishness) by pursuing what you actually care more about, or being honest with yourself that you don't care enough about what you're pursuing to succeed (fame for most people falls into this category).