Actually, you're half-right. Yes people who make resolutions are destined to failure but that's because most people do it wrong. IF you do on the day on or before new year's eve it's going to fail because you're not going to get around it, but. If you start on it early, the resolution may just be successful.
Another thing you may want to avoid is actively making it. You can't just say you will, that makes it less likely you will. You have to DO it, in other words don't think about it, just do it. And the earlier you start, the better things may be.