how can i stop constantly eating ?

[iloveyou.]

i'm fourteen and i am constantly eating. i am usually at home and i eat and eat and eat. even when i know im not hungry i eat. i barely get any exercise. i used to cheer at school but i moved schools and don't cheer anymore. my gym class doesn't do anything but sit there so i don't ever exercise at school. i'm usually grounded so my parents wont let me go running, which doesn't do anything at all but i do it just to think i'm getting exercise. i've tried to change the way i eat but that lasts like a day and then im back pigging out. i don't like water and i know that's bad but i've tried drinking flavored water and i loved it, but my mom only buys them like once a month and it only supplies me with 6 waters. so i only drink water about one week every month, and i know that's bad. i'm struggling cause i hate the way my thighs are and my stomach isn't as small as i would like. and i have big love handles.. i would just love to get rid of all these things but all the exercises that i look up are just not fun at all. can anyone tell me an exercise that is effective, yet kinda fun for a teenager ?