Why do guys dislike petite girls? Thoughts?

My friend has the same dimensions as you and same age and everything and in Uni too. Nothing wrong with that size. As long as you don't look anorexic or look like you hate eating etc. Which you don't. Some people may say that, but trust me, so many people want that size. And you should be lucky, women always try to look younger than their age. You will be happier with your body as you get older.