Hey Andiee,
Having Bipolar is nothing to be ashamed of, and there are lots of things you can do to help it. Don't blame yourself and try not to fault parents if they do not understand.
I have schizo-affective, which is somewhat similar to Bipolar except that I would get different symptoms and it is not only based on mania for me. I take a mood stabilizer: Abilify and I'm thinking about getting off Vyvanse which is for Adhd.
Abilify is approved for people as young as your age from what I am reading. This is how Abilify works: it blocks certain areas that cause mania in the brain, or certain transmitters but not completely so you wouldn't be super sedated. It also seems to have anti-depressant qualities, by preventing mania it can also up in certain areas to help you feel normal in mood. It's not perfect alone, but I've taken it by itself for many years starting at age fifteen or sixteen.
I would suggest seeing a doctor and asking about mood stabilizers or medications to treat the bipolar mania effectively, and to prevent the depression that comes along with Bipolar lows.
From what I've been told, the earlier you catch and treat Bipolar symptoms the greater the recovery or remission rate. Bipolar typically peaks for women at thirty and can start acting as early as teen to early adult years. So by treating your symptoms early on it may help it even out, though I am not 100 percent certain that medication effectively prevents it from getting worse by itself, it certainly can limit the damage from Bipolar.
Bipolar is somewhat degenerative in a sense, that is, if you don't know how to cope with the symptoms they can cause bad habits to form and social problems in the long run. Well, my therapist says that by treating my Schizo-Affective I have stabilized it pretty much over-all. Where-as, If I had waited for say until now...it might be harder to treat if It had gotten worse.
There is always the question of it evening-out as you get older, but Bipolar runs in my family. My mother who was always ant-meds had her Bipolar peak at around thirty, which caused (warning possible trigger) suicide attempts when she was raising us kids due to her mania worsening causing delusions. She is unstable now, without meds and would be harder to get better. It's really hard for me to see her struggles. But I am there for her as her daughter, as best as I can be.
Much love, hun and try and seek out help!!