I'm 44, I'm 3 years, 3 months sober, and have felt the same, but I feel like I truly have an opportunity, that not all is wasted. For one reason or another, with or without drinking, I wasn't a stable human being, I could not have started a career or had a family. I feel blessed to have that opportunity now, at least a career, and hopefully settle down with a beautiful woman someday. Nothing is wasted, the past is filled with valuable lessons that people our age have no idea of. What we are lead through in sobriety many people never get to touch on in their ordinary lives. They too go through life thinking something is missing, not quite sure what a feeling is or how to react, but they never think to dig deeper (or are too scared) Bill Wilson and AA gave a road map to deeper thinking, simply reading through a page or a chapter of the big book and practicing leads us deeper than others.
I get that drinking for 25 years + is a waste, it is, but what's to get out of it? There's something to take, so take that little and don't dwell on the rest. Your job is to move forward, plain and simple. Time doesn't stop. Write down the good and bad , take the good with you, throw the bad away. That's a good life.
Nothing wrong with therapy, sometimes I feel like I should (I absolutely should lol). Fuck it, when I read Gandhi's words that life would be a terrible burden if we carried such a load of memories with us, I officially quit, I finally let go. When a friend of a friend came clean and let me know that my ex was fucking other guys, who and when during our marriage, I was disturbed, but no longer angry and as I walked back into work moments later, I said to myself I closed the flap to that circus tent, I'm moving on.
Pick yourself up however you need to (not drinking) and keep moving on. Trust your instincts (scary for an alcoholic).