Here is some information to introduce you to a healthier eating patterns. Whole foods is a type of natural food, it is the simple food the way nature made it. An apple is a whole food, apple sauce is processed. Pasta is processed. Beans are whole.
Fresh vegetables are whole foods, as are most grains.
The only way to avoid this is to find organically grown foods. Whole is not a rigid definition, it is part of a continuum. Natural foods are better than unnatural foods, and whole foods are the best type of natural foods. There is no absolute correct way to eat and it is unhealthy to radically change eating patterns. Add something for everything you take away, replace unhealthy choices with healthier choices.