Parents don't want to admit their children may have problems, that is all too common. I've had problems for as long as I can remember, and I worry my kids may inherit some of that. Already I see my son is hyperactive and other signs of ADHD. I've talked about it with his mom, she insists it's a normal boy behavior for his age. My daughter is the opposite, very reserved, creative, artistic, and smart! But some times she seems to zone out or gets depressed. The problem is it really is harder to diagnose children.
As for bipolar, you say you have all the symptoms. That's fine, but how many of those symptoms can also fit being a teenager. See the problem? This is another reason why pdocs hold off a diagnoses for teens. As long as you are not suicidal don't over worry. What you might want to do is find a good excuse to see your family doctor. Upset stomach, some thing. And once you see your doc tell him your concerns. At the very least he will be aware of what to watch for. Hang in there! Every thing will work out!