Stop eating unhealthy food?

I'm 15. I think I eat entirely too much junk food sometimes. I eat healthier when there's no junk food I like in my house, but then after continually eating fruit everyday, I really want junk food. My dad says I eat pretty healthy, actually. I will choose fruit over candy anyday, and vegetables over fries. I know I eat a lot more fruits and vegetables than most people in my grade, even my age, but how can I stop that yearn for junk food? And what are some healthy meals I can fix myself? I try hard not to eat frozen foods and I don't eat fast food, but I want to find new ways to cook things like chicken, fish, etc. How can I get my parents to go healthy with me? I do a decent job at eating healthy by myself, but my mom always buys more junk food (not stuff that I eat, but the whole concept is not to buy more) but I'm ruthless with throwing it away. Any tips?