Hi NIN,
I'm not sure if this will be helpful to you now, as I've noted that your original post was a few months ago. Also, I'm far from being a rocket scientist...just your average run of the mill female. But perhaps this info can ease your mind regarding "manboobs". I'm assuming at the time you made your profile that you were 15 yrs. old. Anyhoo, here goes.....
Let's get the main worry out the way first. Again, keep in mind that I'm NOT a physician. But from the little info about you that I've to go by, it seems like you may have Pubescent Gynecomastia.
In 90% of adolescent males whose condition is NOT due to obesity, the breast developement will shrink or disappear in less than 3 years .
Now for a just a couple of possible causes in layman's terms for Pubescent Gynecomastia that I've read about.
Pubescent Gynecomastia can be caused by the temporary imbalance of ratios of male to female hormones. In other words, at this point your body may be producing too much estrogen.
If this is the cause, try not to worry. Your body will "right" itself in time.
Excessive alcohol consumption, marijuana (among other drugs), and steroid use can cause this condition, too. Hopefully, you're not indulging in either. Tsk, tsk, tsk.
Testicular trauma.
And the list goes on...
Hopefully this will help you, if even a little, through the Hellish Hormonal Nightmare known as puberty .
Good luck and hang in there!!