This rings false to me- and I don't mean any offense by that Becky, but it reminds me of a young girl looking at herself in the mirror, seeing an overweight reflection, and starving herself, while those around her see a thin, pretty girl with an eating disorder.
None of us is Grace Kelly- Kate Moss isn't half the beauty she was, in fact KM's face is an odd mish-mash of shapes, lopsided, poor complexion- but she pulls it off because those features well made up and under good lighting, please the camera. I don't imagine I'm ever going to be Grace Kelly, but do you? Just how perfect do you want to be? If what you are now isn't good enough, perhaps it isn't a minutely different jawline and eyebrows that you need, or better skin, or stronger nails- perhaps it's to quit being so hard on yourself and start feeling the beauty of what you already have, because it's a lot more than many girls have- frankly I think you're rather blessed.