How to lose my saddle bags.?

I am a thin girl, between 5'7 and 5'8, about 120 pounds. my body is weird; I have long thin legs and long thin arms, but my butt is huge for my body! if you saw me you'd think I had no bottom. but surely behind me, there it is. I am 16 and ofcourse at this age body image is a very vital thing in my life. I just want to get rid of the the outter thigh and bottom fat I have! my a** is no muscle, just fat. guys like it but I don't. I want it to be toned and I want long, toned legs that I can show off. how do I so this ?!?!? :( I would prefer your personal experiences, body weight height and how you got rid of your saddle bags, how long it took, what you did, etc. THANKYOU SO MUCH :)