How do you get great legs?

I'm 5'3" tall and around 130 pounds. I'm eighteen and I want to have good legs for once in my life. Everything else is pretty good but I hate my legs. They're chubby, cellulite-y, and short. My knees are horrible because they're fat and big and it makes me look like I'm knock-kneed. I know I can't grow any taller but what can I do to make my legs look great? Please!!!