Hey people I need some help. Well, I'm 14 5"3 and 160 pounds and I need to lose 30 pounds in 3 weeks please anyone out there help me!

NOT realistically possible.

People who do starvation diets have horrible results, like all your hair falls out, just for starters.
Plan weight loss this way: eat less, eat no junk, drink no junk, eat nothing between meals, and exercise.
If you want to try to schedule your diet by pounds lost, plan on 3 pounds a week for 4 weeks, 2 pounds a week for 6 weeks, and 1 pound a week for 6 weeks, for a total of 16 weeks - about 4 months. Even that isn't easy.

There is no way to lose that amount of weight. Even getting close would seriously harm your body and cause major long term health issues.