Is this diet alright? Please answer?

I really want to lose 10 pounds by June 5th. I'm 14, 5'4, and weigh 150 pounds. I'm allowing myself 1000 calories a day, and I don't have any problems with it. Starting Monday I ran one mile. Tuesday I walked 2 miles. Tonight I will run another mile. So far I haven't had any success, and I'm not sure why. I think it's either because: I'm weighing myself at least twice a day an obsessing, I'm not taking in enough calories, or I'm gaining muscle weight. The thing is, people are telling me that 1000 calories are not enough. They are for me! My usual daily diet is: breakfast: Pure Protein bar, or Atkins Protein shake. For lunch: Chicken salad on crackers or peanut er and jelly sandwich with apple slices or fresh strawberries. For a snack: A Full Bar (to keep me full till dinner) For dinner: I usually eat smoked salmon with vegetables, grilled chicken with rice, or something along the line of that. We eat out probably twice a week, but I get mostly very healthy choices. For instance at Applebees I get the grilled shrimp n' spinach salad. My daily intake of water is usually 2 cups...please tell me what is wrong with this diet or what needs to be added! Thanks!