This is a topic that is near and dear to me. I've never felt an overwhelming pressure but there are many girls out there who have. The world tells girls that we're supposed to be skinny, so what do we do, we kill ourselves to be skinny. Why doesn't the world instead impress upon us the need to be healthy. Not only does it look way better (in my opinion) it would solve so many other problems.
I know some people take the need to be skinny to an extreme, then there are those who don't seem to care at all. I'm saying be healthy no matter what size that comes to. The number on the scale doesn't mean anything.
Like I said I've never felt much pressure, but then again I've always played soccer which has kept me in pretty good shape and now I CrossFit which has me feeling and looking better (in my opinion) than I ever have. Personally, I'd rather wear a size 8 and be able to claim what I can do rather than claim my size 0 figure.
What I'm trying to say is... stop defining 'fit' by how tiny you are!