Please Help!!! Am I Done Developing?

I went through puberty at a very young age (around 9 or 10) and i developed hips and a but not . Im 15 now and im still flat-chested, however my dont look like they're done growing because (this is kind of awkward) the areola and nipple are still a single mound. If my s were fully developed, wouldnt the nipple be raised above it? Also, is it possible for them to still grow even though its been almost 4 years since i had my first period? thanks for your help!