This is not true.
Depression is a real illness, just like heart disease or diabetes.
And, as you would deal with any chronic disease, you must learn how to recognize depression and control it throughout life. You shouldn't feel embarrassed or ashamed if you're depressed. Let your doctor know how you're feeling. If physicians aren't aware of all of your symptoms, it's difficult for them to make a diagnosis. There are many effective ways to treat depression and prevent it from interfering with the quality of life.