I think you forget that a double negative makes a positive! If you are depressed at the fact that you are depressed, then don't worry, you are functioning perfectly normal under the circumstances. You are basically informing yourself that you are aware of your current negative experience, the actual neurochemical imbalance and resultant systemic manifestations, using your reasoning mind, represented by the narrative voice you hear in your head while thinking. The reasoning mind is condensing your experience of that incredibly complex chemical system into language so that you don't drift off into infinity every time you receive some sort of nerve impulse.
One of the tricks to being in a more positive mind set and to dispell a cycle of self fulfilling depression is to interrupt the process of communicating redundant feedback from the narrating mind about the neurochemical imbalance which you already are aware of. Just like a cavity in your tooth, sticking your tongue into it a million times is not going to fill it up, it's only going to agitate and inflame the nerve, so once you are aware of the need for repair, you can turn the volume down on the narrator who keeps reminding you that you are feeling depressed.
I suggest you focus instead on good breathing habits: breath in through the nose allowing your stomach to push outwards with your diaphragm and then exhaling thru the mouth, letting your stomach fall back in. Feel the force of the exhaled air warm and massage your sternum area . Additionally, humming in low, rumbling tones will help your body break up and loosen physical tension clusters ingrained in your body. Just as if you sat on your foot for an hour and then felt a pins and needles sensation after you moved the weight off your foot, your brain has been sat upon by the narrative mind and left a big old imprint of its ass on your brain and will take some time for the energy of the self fulfilling cycle of depression to dissipate, dissolve and return to it's natural, relaxed state. The more often you practice clearing the mind of the needless narration, the simpler and more effective it gets. Just like learning a dance move. It takes a lot of concentration on the begining but eventually the effort becomes second nature. You don't need to focus on it all the time, but the more stretches you do, the looser the ingrained emotional tension will get and hopefully easier to let go of.
However, if words are still popping into your mind you probably need to also hold an image or symbol in your mind that already has quiet and still connotations to you. What helps me is to visualize this lake in the woods that I walk with my dog all the time. It sounds a bit corny, but if you are trying quiet your mind, it is a lot easier to keep one symbol still rather than several to many of them. It is an exercise just like stretching: you need to use repetition and breaks to reset the "muscle memory" for the narrative aspect of your mind and anchor it in a better place. By focusing on the breathing, and letting yourself feel the air you are pushing out of your lungs against your solar plexus, you mindfully reroute your loci of awareness to a different spot, to where you would experience a feeling of love, or a nice mdma chest glow. This will automatically pull some of the awareness off of the body feeling depressed and let the mind unclench. By allowing for the the cycle of narrating the body's experience of the chemical imbalance to break, you are basically allowing all of the body's built in bodily responses to not have to react to its echo by licking it like a wound.
It is real easy to shoot the messenger when it brings tidings of depression and malaise, and it feels instinctive to think how depressing it is that to feel depressed but it's just a case of focusing in on the carrier wave rather than the message. what I think you're really saying here is that you are positively fed up with depression and are ready to turn off the thought loops that support it. Try out some of the things I mentioned, you might find them useful techniques like I have.