Carbohydrates are needed for energy.
Protein is needed for the repairing and creation of cells.
Think of it like this:
when you are going out for a run ♀️ or out for a long day, you are going to need to eat healthy carbohydrates (rolled oats, ezekiel bread, whole grain cereal, fruits, etc. etc.) so you can have plenty of energy for your day. If you don't eat enough carbs for the day, you won't have energy and you'll feel tired for no reason.
Proteins are essential because they build and repair your cells. In general, proteins are required for the structure, function, and regulation of the body's tissues and organs.