It's probably good to approach nihilism from a skeptic's angle. Think about who nihilism serves and creates profit for; the perfect consumer is a nihilistic consumer. Nihilism and hedonism are ironically linked at the hip.
What snapped me out of my nihilist arc was that whether or not life made any sense or had any purpose (and I wasn't sure at the time that it did), I certainly preferred to be as much as possible "my own tool" rather than someone else's.
Yes, most of the world struggles constantly and has struggled forever. But I am the result of that struggle that made it this far, as are we all. The best I can do is keep that survival going, and maybe make the world a little closer to a less idiotic and brutish reality than the one I entered. That requires an intense dose humility.
I am not going to change the way everything works all at once, but to view things as all or nothing somewhat entails believing that I have a lot more power than any one person does. That's unrealistic. If I more realistically instead "think local" then my actions really do matter, even if it's on the microscopic scale rather than macroscopic scale.
And surprisingly enough, thinking and acting on the microscopic scale has proven in my experience to have a funny way of creating macroscopic effects if iterated consistently over time.