Beauty changes -- or at least our conception of beauty has changed over the past 500 years. That, in and of itself, can be a refreshing thought when everything in our culture tells you that what is beautiful is x (x being Angelina Jolie, Jessica Biel, Halle Berry, Kate Moss), and if you don't look like those women, you couldn't possibly beautiful.
You only have to look at history to see that standards of physical beauty are highly relative. To prove this point, I found a video that traces the changing face of Western beauty from the Renaissance to the 20th-century. And while the images of beauty in this video are all white (a big problem, I admit), I hope it still proves that beauty can be found in all sorts of sizes and shapes.