Your look can't always change you. But you can change you. Don't be mislead. Fashion modeling isn't the only modeling out there, did you know there are 40 year old men and 60 year old woman modeling?
I wouldn't change your nose, your hair, yourself unless you seriously think about it, and modeling is really more about your personality and using what you DO have to model. Who cares if you don't have height, there is plenty of modeling you can still do, you just have to seek it out and be prepared for the challenge of treating modeling like a business, because every brand, magazine, and product needs models.