Pregnant with our second child and I feel miserable and trapped

My wife and I have one child already and now she is pregnant with our second. I am not happy about it. I don’t feel like I want more children and our situation didn’t really evolve in a way that would make me want more children. When we had our first child, I thought if I ever have more children, I want them to be close in age, but in the meantime my mental health has gotten worse. My job is also more demanding. I really feel miserable and trapped and I don’t see a way out. I feel like I am a failure and that I have let my wife down. I wase hoping that I could grow more into being a dad, but I just can’t bring myself to love being a parent or even see joy in being a parent. The more present this child is in my life, the more miserable I get. I don’t have anyone to talk about this, because society doesn’t want to see that being a dad isn’t the best thing in the world or that being a dad is a sacrifice and that one has to get used to it. Being a dad is the most depressing thing that has ever happened to me. When I see happy dads in media, I feel like I am just a failure.