Don't wanna let her down

Chad
Me and my wife has been trying and she's really into it. We have done a lot to try, and I really want a baby but when she asks me "do you wanna have a baby" I say " yes, and no". The reason for me replying that is cause I DO want a baby I'm just scared, I'm scared that I won't be a good dad or that I will raise him/her up wrong, or I can't provide for them. Me and my wife are living from pay check to paycheck, and I just want the best for my wife and my future kids, also im scared i won't get to spend as much time with her with a baby, I mean I don't know It's just a thought, I'm scared of me failing is what it comes down to!