How to get skinny legs?

Ok, so I'm 14 and I weigh 135lbs. I am so uncomfortable with my body its not even funny. Every time I think I look so good, and I feel good about myself before going out. and then when I go out, I see 2345654345643 other girls who are 3456432453 billion times prettier with really nice bodies with the tanned skin and the skinny legs and the skinny arms, and flat stomach. I plan On going to see Criss angel perform in July in las vegas, and I can NOT afford to have this attitude and low self esteem. I want to feel good about my body. My goal is 120lbs. I'm already running on the treadmill..any other ideas for faster results! I WANT SKINNIER LEGS! :(