Hi Rinaa,
If you have a strong female gender identity, it's best to find out now and do something about it. Don't wait while T completely destroys your potential to transition to a passable woman if that is ultimately what you'll want to do. Talking to a therapist who specializes in gender issues is one way to find out. After some discussion, if a cross gender identity is suspected, the therapist will authorize the taking of hormones for a trial period. Taking a T-blocker and an estrogen is very effective in diagnosing cross gender identity. If your dysphoria clears, the diagnosis is positive, if it worsens, it's more likely that your attraction to femininity is fetishistic.
If you take PM in a sufficiently high dose, the same effect can be experienced. For me it took about two weeks on PM at 2000 mg/day to feel the mental benefits. The difference was unmistakable. For me, those benefits were maintained all the way down to just 1000 mg/day. Your experience will likely be different. The beginnings of breast growth take considerably longer -- two or three months is common.
You don't have to tell the world what your doing if it will likely make your life difficult. You will be able to disguise your physical changes for many months. Eventually, if you take it that far, you will be faced with the decision to come out to family and friends. You could lose some of them.
There are so many factors to consider. Do you ever want to father children? Don't try to predict the future on that. Have some sperm frozen just in case. Do it before you go on HRT (herbal or pharma) while you are most fertile. Your sex drive and fertility will be quashed by taking PM.
What you are contemplating is very serious, but I think it's good to take steps to deal with it now rather than wait. Approaching one or both of your parents with your feelings should be considered, as well. Don't assume you know what their reaction will be. Getting them on your side would be a huge help to you.
I wish you well,
Clara