I'm 100% percent convinced depression is not a real thing
Why do you think depression is not real?
Depressed people are soulless, merely pretending to gain others sympathy.
Depression is hard to understand when you don't know much about it but it is not good to disregard how hard people who have depression have it. People will think that you are heartless if you tell them how you feel.
I'm a rational human being and I know I'm right about it.
Depression has already been medically proven to be a mental condition, you should try to do more research and talk to a professional to enlighten your curiosity. Try not to put others down who are suffering from such conditions.