How to lose 15-20 lbs in 2weeks or more major fast?

i really need to lose a couple lbs im about to start school and i really wanna look good since i just moved to a new state and i just got done wit mi school cloths shopin wen i saw all those other prety skinny girls tryn on cloths i felt like a stupid fool for eve being in the store i felt lso fat i had 2 sqeeze into a 3 i know im young for 14 2 worry about mii weight but i want 2 loose it healthy or bad way either or i just need it gone please help..........!!!!!!!!!!!!!!! and NO bullshit on how i need mental and physical help ..........