Will I Become Fat In The Future

Right now I am 15, 5'4", and 200 lbs. I have thunder thighs and a huge round belly. Any weight I gain goes straight to my lower belly/gut and gives me a big muffin top. I am a size L/XL in shirts and a size 8-10 in jeans. I am much bigger than most people my age and I'm still growing. I get looks and comments all the time about my stomach because of how big it is and how young I am. I mostly just live off of candy, chips, Taco Bell, and KFC. I rarely ever eat healthy because everything is gross.