Weightloss help please?

ok so im goin 2 florida in 19 days and ive been sliming down a bit but i still dont know if i can get the way i wanna look in 19 days so i need weightloss advice please.im 13 years old and i weigh 151 and im 5'3 if that helps any so please help me!and i dont want to hear negative stuff please!thanks!:)