i think it's a little more to do with height also. it's the individual and their body composition. a 5ft person could have a 28 inch waist and 38 inch hips and still have a low body fat percentage thus look perfectly fine.
op, i think without pictures only you can decide. or perhaps ask people close to you? maybe even see a doctor if you prefer a professional opinion.
are you naturally small? i have a friend who's a little taller than you and has a 22inch waist and 34 inch hips but she looks soooo much smaller but not to the point where she looks wrong.
you said your bmi is 19 and although bmi is usually a bit crap, at least it tells you that, for your height, you're at a healthy weight?