Hello JEN.
Your doctor advised you birth control pill , you are having small breast, large amount of hairs on back, irregular period , hands are larger in size then other family members .
Read this carefully , you may have
cyst in ovary , cysts are often caused by hormone changes. Using BIRTH control pill sometimes help regulate hormones levels so that the cysts can be taken care of.
Your gyne will likely want you to come back after you have been on birth pill to see if the cyst is gone.
At that time the doctor may suggest you to stop medication.
So take treatment as advised your gyne.
Since , you are 14 years old , still growing and may attain 5'6'' , but it all depend on hormone release.
So also the size of breast .
While height , breast size all depend on gene of an individual .
Still if you have any problem regarding these things I advise you consult an
ENDOCRINOLOGIST and get his opinion.
Good luck.