Eat less junk food

Actually, my goal is to stop eating junk food, but not to eat it less. I have gastritis and I’m not allowed to eat junk food. Usually (not always), after school when I and my friends are going to eat, we go to fast food restaurant, and sometimes after I eat something of junk food I have stomachache. I want stop eating unhealthy food, but I can’t, it’s so delicious! I want to eat less sweets too. But I really like white and milk chocolate. About 4 months ago I started to drink tea with less sugar, now I’m drinking tea without sugar at all, and I really like it! Now I’ll try to stop eating junk food.