I agree with margy, but also want to mention that I have a friend with a really tall dad and an average-height mom, and her brother went to college at about your height (5 foot 6 inches), and in the first two years of college (so, he would have been 18 and 19 years old) grew six inches. It is definitely possible to get a later growth spurt. So, a) don't worry, you will look like a man even if you don't grow a lot taller, and b) you might still get taller.
Well I have to tell you that many famous and powerful people in our world are smaller than 5'6' movie star like Dustin Hoffman , President Sarkosy, the list is endless and how about a woman I am your height I have always considered myself of good worth ,kind, funny and a protector of many things.So a healthy diet is good not a 'fat' diet so forget that idea, concentrate on building good muscle tone, if you want to add a few inches they do make some really good shoes with ;lifts' movie stars use them a lot .Most of all aquire a facinating, funny,kind ,personality. People like to feel good and a sense of humor, is in my opinion the most important attribute along with kindness ,a human being can have .Get a good hair style some fashionable clothes and work hard .move in decent circles, no not bars ..Gyms, sports, hobbies .Good luck