Why am I not losing weight?

Anonymous
I don't count calories or follow any particular diet plan. And every once in a while I east a pizza or burger, but overall I'd say my diet is pretty healthy.

I do 20 - 30 min of cardio every morning. Usually running or with an dvd, in the summer I sometimes go swimming too. Before I go to bed I do Pilates or Yoga for like 10 - 15 minutes.

Additionally I play field hockey twice a week and do workout plans on two other days. I've done this since I started college last fall but I didn't lose one pound. I'm kinda chubby so I want to lose weight and I'd really love to know what I do wrong
Why am I not losing weight?
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