You've figured out something important: the world around you is filled with very convenient, unhealthy food. Eating healthy requires at least one of two things: some extra effort, OR a willingness to eat very simply. You can eat in a healthy fashion with very little work if you're willing to eat the same thing as your "base food" for many meals -- just cook up a big pot of whatever and reheat. You simply don't get cheap AND quick AND easy AND tasty AND variety all at once. Pick your poison and swallow it.