Hi, welcome to this forum.
First of all, you may seem to have nutrition doubts, so this should be on that forum (as well), but I am concerned that you may suffer from an Eating Disorder (you don't mention it clearly...).
Then, my advice would be to eat a bit of everything: dairy products, cereals, fruit, vegetables, meat, fish, you name it. That's what makes it more balnced: having a bit of everything. Some things will give you energy, some will cheer you up, etc. All of them are needed.