Stop! Now! This stuff is dangerous! It leads to soft drinks, which leads to hard drinks which leads to cocaine which leads to atheism which leads to hell!
If you are that young then you probably will not have any problem with caffeine for quite some time.
In an epicurean kind of way, you may not want to start because eventually, when you get really, really old and decrepit and your heart needs to relax more often your doctor is going to force you to stop. Withdrawal can be quite pronounced and painful. You will become irritable and contrarian, your mind will wonder at inopportune times and you will grow hair in your ears. But then at that age this just happens naturally anyway so more of the same will not really be noticeable.
Seriously, if you are normal and healthy, no congenital heart issues, etc., and your personality can handle the mild addiction with moderation then you should be fine.
Having been caffeine dependant most all my life (still am) the only down side I find is the expense of Blue Mountain or Arabian Mocha Sanani. Like wine, you can lose yourself in the mystique of the brew.
But, having said all that, do not set out to become a caffeine slave. There is not intrinsic need nor benefit to being addicted to anything except maybe water or air or Haagen-Daz Chocolate Ice Cream.
If you do find that you have become a slave to that noxious heathen-devil drug of modern industrial society we call caffeine . don’t worry about it.