Open Question: Good treadmill and losing weight?

Ok i know many of you will say i am too young and things but i would like some answers please :) I am 13 and about 5'7-5'8 i am of a muscular build as i do much horse riding yet i am overweight and would like to have nice looking thighs. My parents are thinking about getting a treadmill as my dad is a runner and i do not want to run in the streets in front of my friends Any good treadmills