I'm 15 and my periods have stopped?

Bigdreamer Asked: I'm 15 and my periods have stopped?I am a virgin, so it isnt sex related at all. I haven't gotten it in 4 months. I have no idea why I haven't gotten it. Also, I go through the pms 'phases' (breaking out, bloating, and major mood swings but NO cramping) but the only thing missing is the actuall blood. I do play basketball and have practice 6 days a week for 2 hours. I am a starter on games and play the whole game-no rests. I know I don't drink enough water-could that be it? I sleep about 6-7 hours a day. My eating habits are not the best. Sometimes I

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