What's the fastest way to loose weight?

Okay, so i'm 16 years old and i'm a junior in high school. I'm abut five foot four and my avg. weight is 160. if you really do look at me i do not look like 160 lbs at all! I do have a lot of a muscle for a teenage girl. i mean i guess it's kinda a good thing. I am very toned. I think that's where all my body weight comes from. Anyways, i really want to get down to 130 maybe 125. I don't want to do drugs to loose weight WHATSOEVER. my friends say it works. I'm not gonna get myself into that. As physical activity i cheerlead and suprisingly it's a great work out. we condition and do cardio alot b.c of our dances. and all the other times i play softball. Like fall ball and all summer. so yes, i am an active girl. but i just need to loose some of that pudge and want to get down to those weight. for christ sake, my boyfriend ways as much as me....