There is a difference... if you're telling a story, you might not be trying to get people to believe you. You might be just telling it for fun. I think it's okay to lie if you're doing it to protect someone else. And I don't think there's much wrong with telling little lies... like saying you're fifteen to get in to see a horror film at the cinema when you're really thirteen. I don't really see anything wrong with that. It's not like you're hurting anyone.