Take a few moments to breathe and try and keep calm - I know you're probably terrified right now, but this isn't the end of the world.
Firstly, I'd suggest doing another pregnancy test if you've only done one - they're not always 100% accurate. If that comes up positive then, like it or not, you're going to need to see a doctor. As for your parents finding out - it might not be as bad as you think. They might be mad, they might say they're disappointed but ultimately they can support you.