If your boobs have begun to develop (something called "breast buds" -- they feel hard and a bit sore in your chest under your nipples at first, though they don't stay that way), you're on your way. If not, they will come pretty soon.
I will say, I have had boobs and have not had boobs, partly due to pregnancy (got big then) but also just with somewhat fluctuating weight. The bigger your boobs (especially if you are short) the fatter your whole body looks. It's kind of this prow-of-the-Queen-Mary look, and made me look like a dowager. I liked the sleekness of having a slimmer body look overall, and boobs can change that impression. Not that I'm saying you shouldn't want them, just that sometimes it's not that great for your overall look, to get them. So try not to worry, it's going to be good either way.
I am 15 i turned15 on march 4