Is depression really a chemical imbalance? how can i get out of it by myself?

I remember learning that depression was a chemical imbalance. I legit picture a brain with A particles on one side and B particles on the other but there are more As then Bs. Silly visual image, but when I can't get out of bed, that is what I picture is happening.

Then I think- "well it's chemically happening, I can't change it"

I'm pretty sure this is not what is happening. But I actually don't know enough about it. Can I actually fix it myself? Is there something I can do to "rebalance" my brain?

Would love to know what your doctors have told you, please pass on the knowledge!