Yes. I can fake emotion too. People tell me I'm a terrible liar though. I'm probably not good at faking emotion either.
I dunno, in some situations, lying can be an option. I prefer to just avoid the issue, though. So, lying by omission, I guess. Before it comes to that, though, why not just have a good talk with her? Tell her that you don't want to lie to her and say you're fine when you're not. But at the same time, you don't want the whole world knowing. If she's your friend, she'll listen.
_________________
I don't suffer from insanity. I enjoy every minute of it.