As a person who lives with mental illness, I've heard many condescending, ineffective comments about it. "Just lighten up!" "Just change your attitude!" "Everybody gets sad sometimes."
Someone with a mental disorder doesn't experience emotions the same way. When you have clinical depression and/or anxiety, it is not that simple. That's why it's a disorder.
How much of these feelings are normal?
No one can be happy 100 percent of the time. We all get sad. We all get negative sometimes. It is okay to be anxious; it's okay to be sad.
In therapy, we try to find a way to cope with extreme emotions. Emotions can aid in our survival. Negative emotions can signal a deeper problem. It can signal that your relationship or your job may need some attention.
Accept how you are feeling. Denying them and bottling them up will end badly. Express your emotions, and you will feel better. We experience such a wide array of emotions in life. This is why everyone needs to practice coping mechanisms. Being sad is okay, but extreme depression is not. Get to a doctor if you feel that something isn't right.