"75% of the time we spend with our kids in our lifetime will be spent by age 12"
I was one of those ppl that made the decision of not having kids. I am a 40 yr old man now. This was the single worst decision I've ever made in my whole life. My spouse is 39 so the window has closed for biological children, more or less.
My life is now dominated by regret every day. I just can't get over that feeling. I've tried many things like therapy, counseling ect. It only helps for a little bit but I am still doing therapy. Some nights I wake up with panic and stay up all night with shallow breathing and high heart rate.
I used to LOVE working and all things tech, now just make do and do bare minimum to not get fired. I 've gotten few promotions here and there but nowhere near my potential of where my career could've been. Everything is just secondary, nothing is interesting.
I am constantly triggered by families and young kids. Even reading that post sent my heart rate soaring (apple watch) with anxiety . I just don't know what to do, its too unbearable. I fantasize about things like getting cancer and that seems to calm me down a little bit. Sometimes I fantasize about leaving my spouse, who I love to death, find someone who I can have a child with.
You are depressed, anxious, and have lost sight of what you want out of life. I don't know if kids are the bandage here. At the least, you need to figure out yourself before, or at least in parallel, to working on introducing young children into your family.
It's hard to offer specific advice on such a broad topic to a stranger. You've taken the right steps (therapy, counseling), but you have yet to find your inner peace. What do your social connections look like? Genuine social connection is usually highly correlated with happiness. Those connections can give you a sense of purpose (which is part of having kids) and a "place" in this growingly isolated world.
I'd start there, if you have not. Investing in people and in the relationships you have is absolutely critical to ones happiness. I'd be curious to hear more about how you see this part of your life.