A working definition of fathering might be this: fathering is the act of guiding a child to behave in ways that lead to the child's becoming a secure child in full, thus increasing his or her chances of being happy and fruitful as a young adult.
Because we men have been physically stronger and more arrogant, we've influenced much of the cool stuff of the world, like basing the definition of courage on what we do on battlefields rather than on the patience or endurance or tolerance necessary for a sometimes painful daily grind that includes small children.
Being a father can 'unreason' your worldview, or at least make it very flexible, and that can create all sorts of fun and insights. It's sad that children's open-eyed wonder and sense of play begin to fade as they approach adolescence. One grand function of fathering is to keep the fading to a minimum.
As an older dad who grew up in a rural culture in the South, certain things were expected of women, and that included raising the children. But I think it's just as important for the father to give the baths, to hug, to change the diapers, to tell the stories.
If you are a good person, you will probably be a good father. Try not to worry too much. If you don't feel apprehensive just before your first child arrives, you are abnormal. Though catastrophe doesn't come as often in childbirth as it did a few generations ago, we naturally fear it.