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Why do I keep passing out?

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I am 12 years old perfectly healthy, i drink lots of water,I am not overweight, and I play many sports, so why do I pass out randomly? So far since summer I have only passed out three times but each time was out of the blue and completely random. The first time was when I was babysitting (but thankfully my older brother was there and he knew what to do), the second time was when I was sitting down and I tilted my head back a little then passed out and the third time was yesterday at a party with my friends and they were able to help me but it was scary. If it helps I get dizzy when I stand up a lot of the time and I have to sit back down. Can anyone tell me what's happening?