Teen needing to lose weight

Options
I'm 17 and I know you have to be 18 to John on here but it's literally only six months till I turn 18. Anyways, I'm 198 lbs. and I'm 5'7. I really want to look BEAUTIFUL during prom. That's in April. Therefore I want to be around 150 so I'd have to lose about 48lbs. In 5months!!! Is that possible!? Please help I feel overwhelmed! What should I eat and what ex resizes should I do and for how long please help!