[Femme Fatale]

If you feel like you really need to tell people, go ahead and tell a few of your closest friends. Just be sure to stress to them how important it is to you that no one else finds out. Make sure you tell the ones you can trust the most with this information. That's all you can really do. :/
As for whether or not you should tell someone, this might sound cheesey, but you'll know when the time is right.