Hi there,
Welcome to our forums. The best way to determine if you truly are Bipolar is to be evaluated by a mental health professional, preferably a psychiatrist.
Quizzes and other reading material, though helpful, cannot and never will replace the expertise of a psychiatrist.
Symptoms of adolescence can mimic mental disorders but are usually due to hormonal changes, and brain chemicals, etc.
Imbalances of brain chemicals, can be the main cause to many disorders, and most of the times require medications to address such imbalances.
Genetics too, play a big part in mental disorders, especially Bipolar disorder, so it is always best to see a pdoc, to determine your diagnosis.
Give some thought to taking this up with a mental health professional, tossing around info., quizzes and other informative stuff just may cause more confusion on getting to the heart of this, going only by written material and internet stuff can only cause more confusion and thus anxiety also.
I am wishing you lots of luck with this, feel free to let us know how you make out.

Sincerely,
DE