If you have said this the you are making excuses for child neglect. This was invented to help the parent to lie to him or herself. It is popular nonsense. You feel lousey because you think you should be happy all the time. That is not true.
Nothing is as distructive to children.
You will pay dearly. Children grow up. They find the truth no matter how well it is hidden. Yes, there may be cases where it is best. Yours probably isn't one of those cases.