It makes sense that you were not receptive--that's what depression does--the worst part about it is that it robs you of any hope and optimism so that any changes that might actually help seem futile. It's good that you are in a better place and you are so right about dying from alcoholism--it is a terrible way to go. My sister has suffered from chronic depression all her teen and adult life and she has been on one antidepressant after another, none really helping all that much. For years doctors and other people have been telling her that it is a physiological problem that can be treated with drugs. But those drugs have done as much harm as good. Whether depression is biologically based or not, practicing mindfulness techniques and using the philosophy of accepting, feeling and then letting go of emotions as they arise can be transformational.
When I hear people say that nothing in their lives engages them or makes them happy or has any meaning that is when I know that the problem is within. Every one of us has the capacity to feel joy, boredom, happiness, cynical detachment, euphoria; sure, some people are more hardwired to see things more pessimistically or more optimistically, but overall we all have the same capacity. I am old enough to have lived through intense emotional states and come through the other side many times. What has that taught me? That old cliche that it is all attitude and perspective is indeed the only reality. If the therapy that you have tried, and the SSRI's that you have tried, the people that you have connected with and the work/activities that you have tried all fail to engage you then you need to make a huge change. Quitting alcohol will probably go a long way towards improving your depression.
I know that the road to recovery is not an easy one and that your energy and efforts will be taken up initially just dealing with detox and quitting strategies. Once you have gotten some solid footing though, you might try to think completely outside your comfort zone in terms of connecting with life in a way that sustains you. It could be helping others, or it could be getting away from everyone and learning to live with solitude. Whatever you envision and then that voice comes in to say, "that's not realistic"---do that.