How do i get motivated????

ok so i'm 14 1/2 and i'm pretty good looking you could say but.....i have a bit of a tummy...theres some flab there that a want to get rid of.....i just can't seem to get motivated to loose it though......i eat right (VEY HEALTHY....my moms kinda of a um....health freak...in a good way) and having 5 younger sibs i get a little bit of a work out but i love to sleep and i can't seem to get up but when i do get up i go straight to the fridge and eat somthing......I want to have a toned FLAT stomach by bathing suit season next year .........can anyone give advice on how to get active AND MOTIVATED??????