I am 16 years old. i started to eat healthy about 2-3 days ago, i only ate vegtables, chicken breast ect?

Congrats!: That's great, congratulations! it is really tough to develop healthy eating patterns, but doing so while still a teenager will really help you have a better chance of continuing as an adult. Make sure to eat a variety of healthy foods and not starve yourself. I didn't see a specific question about this, so feel free to ask if you have one.