Pant sizes??!

Pant sizes??

im 13 5'3" [[short legs :( ]] ok so i went shopping today and i tried on a pair of size 3 jeans. they didn't fit! i got very agrivated that i had to up a size and now i really want to go back to being a size 3 or even LOWER if i could. i dont care if i gain weight through this as long as it looks like i lost it. what are some things i can do for me to lose pant sizes. the biggest problem are mi tighs and butt. excercises? i really want mi thighs to be thin. wht foods should ieat and wich ones should i stay away from becuz they make thihs bigger?? Please help!. dont say im still growing becuz i kno that but i really want to get thin b4 school starts. all answers are APPRECIATED>>> =]

4 days ago
please dont say go to the gym and become a member becuz im too young to use any of their equipment. and please dont say im still growing dont worry about it. I AM WORRIED ABOUT IT. nd i wanna be thin. thank youu.

first, i hate it when people say im still growing or to join a gym too. I WISH i could go to a gym. but what u gotta do is run and use resistance bands. running does both make u thinner and tone u and resistance bands tone and give u muscle to burn more calories. i wasnt allowed to buy resistance bands(but i secretly bought them) do swimming-it should be very affective+do squats too.
stay away from cakes, soda, fried/fatty foods and all that other unhealthy junk. it can actually go straight to ur thighs and butt. im trying to do cardio alot but theres something wrong with me and i cant very much