Hi Anisha,
#1 of I am going to suggest you see a therapist.
#2 DO NOT SELF MEDICATE. Contraceptives will not give you the satisfactory end result.
#3 Ask your therapist to assist you into getting the proper prescription HRT meds.
#4 As for telling your parents I believe that this will be the first order of the day because if I am correct I believe you will have to go through your parent for consent to see the therapist.
#5 You could try seeing your family Doctor for referral to a gender therapist, but eventually your parents are going to know.
#6 When you start Estrogen it will begin the process of redistributing fat in the areas that a female your age has and at the age of 16 the development can be quite rapid like in a mater of 6 months upwards. Beasts are the first to begin to grow. There is also a reduction in muscle mass. Will the estrogen have a calming affect, well you will certainly feel much more comfortable in your skin as time goes by.
#7 Estrogen will have some subtle effects psychologically, you will notice a difference on how you see and perceive things, you will get more sensitive to your outside environment, and more sensitive to feelings and emotions. feeling hot flashes and sensations in places you haven't had before that you were aware of.
#8 The psychological changes I am not certain, I beleive that those will remain for the most part.
#9 The physical affects are permanent.
Cindy