Is fatherhood for me?

I think you need to decide before you get married. Ask your fiance if having children is something she is set on. Starting a family is a big deal and to some people it is a deal maker or breaker. I'm not saying that you should decide to have kids because she wants them, but you should be honest with her (and yourself) if you don't. Ask yourself this: what happens if you have children and then you totally regret it and feel trapped? Or, what happens if you decide not to and she resents you for it later and your marriage gets messed up? My best advice would be to spend a lot time around kids. Babysit for family and friends, often. This will give you a good idea if you think you can handle it or not, then make a decision. and remember that you don't have to have them right away, and you don't have to have a bunch of kids if you decide they are something you want.