What can I do about my facial problems?

I'm 14 and my face has lots of problems. It is covered in cyst scars and black head scars, I have combination skin which mean I have my forehead, nose and parts of my cheeks are very oily while the rest of my face has normal skin. All my friends have smooth skin with a normal glow whilst mine fells lumpy. I don't eat that much fruit or veg so I think that might be the problem but my facial skin wasn't always combination. Two years ago i got sunburn on my upper body and face. What can I do?