Are their any diets that follow the food pyramid at least almost perfectly?

I am not fat. I am a skinny teenager who doesn’t want to become a fat adult. It has happened to a lot of people in my family and I don’t want to be like them. I don’t want to go on a hardcore diet I just think that maybe I am eating to much junk food because I am eating a lot. I still want to be able to get the sweets and other good foods I like so do you know any diets that might work for me.