Do You Ever Feel Like a Fraud?

Sometimes I feel like a fraud. I mean, I do my job fairly well and I come across as someone who's got it all together and knows what she's doing. But sometimes I stop, look around, a think "omg, I'm really not doing all I could and what I am doing isn't what people think it is". Maybe it's my own insecurity or maybe I could try harder. I think the crux of the matter is that most people only see the outside of me. They don't see inside where I live every day in my perfectionist world. My almost OCD world. My anxious world. They don't see it because I've become a master (mistress?) at hiding it--at least in public. It's a lot of work to hide your real self. It's exhausting, in fact. 

But I know from experience that we shouldn't give up and we are our own worst critics. I've done more than I ever dreamed I would do so I must be doing *something* right. I think. Sigh.

Is it just me or do other people feel like they're a fraud too? I don't know. But if you're reading this, please tell me your story.