Is it ok for teens to use black magic?

It is important first to be sure of your terminology. Magic is the manipulation of naturally occurring powers by the hand and will of an ethical practitioner. Magic is neither good nor bad, black nor white is just is. The manner in which the magic "power" is gathered and used is what determines its polarity.

Those people who practice magic come in all shapes, sizes, colours, nationalities, genders, and ages. The common thread in most of them is a recognition that you must take full and complete responsibility for your actions and the results thereof, because there is a universal balance and the "Rule of Three" (That which you send out, will return to you threefold) does work.

If you are interested in learning the practice of magic, I recommend you spend time reading, studying and searching for an ethical teacher. There are hundreds of books on the subject available in your local library and New Age/Metaphysical/Occult bookshops. Reading one will not make you ready to undertake magic. Reading twenty or so will put you on the right path. If you are unsure a specific book is a "good one" check to see if there is a chapter on the Ethics of Magic in it, if not, I would recommend you keep searching. Buckland, Conway, Cunningham, Grimassi, Amber K, Starhawk and Telesco all have multiple books on various aspects of the subject and are a great start.

Teens do need to be aware of the sensativities of their parents, after all you are living beneath their roof and dependant upon their largess.

If you are looking into magic as a possible spiritual path, be prepared for the possiblity of challenge or even disaproval from your parents. Of all the spiritual paths Magic and Witchcraft/Paganism are some of the most misunderstood.

If you are looking into the practice of magic as a "hobby" or casual source of "power over others" then I recommend you rethink your plan... see the Rule of Three above.