My almost 15 month son won't eat?

ok so, my son will eat his oatmeal or eggs in the morning. This is never a problem. Other things he eats are applesauce, sweet potato puffs from gerber but no other flavor or no Cheerios, he will eat anything chocolate or muffins cake ect... some Parmesan pasta and spaghetti-o's but that is it! he wont eat fruit or veggies or anything healthy. I try to give him what we eat and if he dont eat it he just dont eat but then all he gets is milk and he will protest for days! giving him only whole milk is not healthy what can I do???? O and I tried letting him feed himself. That doesnt work either.