Hey hun! I have bipolar disorder and know exactly what you are going through, my best advice for you would to be sit down and talk with your parents, the more "lenient" one and get one to kind of listen or at least give you some kind of positive input. Usually if you can get one guardian on boat, the next one will play along with what it is so nothing becomes a fight. Before you sit down with whichever you're most comfortable with write down your exact feelings you're having and maybe some symptoms that you have that they have noticed! You have to show you're very serious about this topic or it could easily be blown off and called "teenage hormones" don't be afraid to express your feelings when you're having these bipolar moments because if you keep it to yourself they could never know the extent of your problems and will continue to blow it off which will make you blow up, and cause you more issues like tremindous anger problems which could turn into: Depression, suicidal thoughts, eating disorder, social anxiety, etc... Wish you the best of Luck! Oh and another tip, write down any moments you feel like this for a month and what caused them and how you reacted signed with a date so maybe they can visually see a pattern that you're talking about!!
Speakin of bipolar to some people is difficult bordering on impossible. I have been through this before but it is not your fault. Bipolar disorder is not as stigmatized as it used to be and we are many... we are hurt but loving and that is something that is going to aid you in the future although you may not be able to see it right now. Please come on here and ask anything you want. We are here to help. Also check out the DBSA website: /www.dbsalliance.org for some more support and information.