It may help to try to think of it as a chemical imbalance.
The name depression comes with so many over tones that it's hard to think of it as it actually is.
Your brain is like an engine that runs on Serotonin, Dopamine and a bunch of others.
Not all brains regulate these chemicals correctly or receptors don't interpret the chemicals correctly.
When a normally functioning brain experiences stuff that makes most people happy it releases chemicals that make us feel happy.
If your receptors are not working right, then when they sense the feel good chemicals they don't know that is what they are or to what degree the happy was supposed to be so it gets down played.
I have to reiterate to my mental health prescriber almost monthly that my depression has never been the kind where I don't want to live any more. NEVER!!!
It's just my brain doesn't easily interpret happy stuff like a normally functioning brain would so I don't feel the happy that everyone else does or thinks I should.
THat was kind of a nut shell version of my 2 1/2 power point presentation of " What I have learned about real depression from time in the saddle." LOL
Do you know what kind of depression you have?
How long have you been effected by it?