How can I lose weight, fast?

I am a 17 year old. I weigh 105 pounds at 5'1 I want to lose at least ten pounds so i can look better in jeans and clothes in general. I do not want to starve myself. I started my diet yesterday. I did 150 situps and 2 hours of cardio. Yesterday I ate rice and chicken, 4 perogies, a granola bar and half a bottle of gatorade. Today I had around 30 minutes of cardio, and didn't do any situps because my stomach hurt too much. Anyways, what I ate was sushi, rice and chicken and 5 wheat thins and one chocolate bar :| But I burned it off immediately. I want to know if what I am doing is right? Because I really really really need to lose these extra pounds.