Just because life doesn't come with meaning doesn't mean it can't have meaning. It's not that nothing matters, it's that you get to decide what does. That's the scary part, but also the good part.
If nothing matters in a big, universal sense, then the small things matter more, not less. The cup of coffee. The person you were kind to today. The apology you gave or received. Those aren't meaningless, they're all the meaning there is.
So yeah, life doesn't matter from above. But from the inside? It matters because we are here, living it. And that might be the best part.