How to lose fat and get toned?

Im fourteen and pretty skinny for my age, and i do have muscle everywhere. I play volleyball so im very active. I was told if i don't stop eating too many sweets i would be diganosed with diabetes. So im not eating as much sugar. I still have some fat though! I just want to get rid of the fat. But not build more muscle. I also don't want itty bitty and a small . I also have cellulite but it's never made sense why i have it. I would be awesome if i could get rid of that too because it's just weird. I guess i don't care about weight, i just want to be toned.