There's something you do that you know isn't great — biting your nails, picking at your skin, checking your phone every two minutes, snacking when you're not hungry, an endless game you can't put down. You've decided to stop. Many times. And then you catch yourself doing it again without even noticing you'd started. It's frustrating, because you genuinely want to stop, and yet your hands or your brain seem to do it on autopilot, almost behind your back.