I'd say having kids would be scary: how do you not mess them up? I perceive raising kids to be more like a baking recipe than a cooking recipe...little things could go wrong to fuck up the whole batch.
Oh and then the whole child birth thing seems terrifying
It's hard to know how much is nature and how much is nurture or what is right and wrong.
My son and daughter are complete opposites. He's very laid back, doesn't ask for much, when told he can't have something he's totally fine with it, has no shyness when it comes to conversing with adults or speaking publicly - sometimes I wonder if he's not too laid back.
My daughter - well it's like living with the Tasmanian Devil. She is wild, devious, cunning, totally fearless. She is the youngest, which could be the reason for it but she is constantly testing the boundaries in a way her brother simply never did. When told she can't have something she'll run the whole gamut from tears to kicking and screaming - even though we don't give into it. Most of the time she's great but if she decides to be awkward, she will.
It can be tiresome sometimes and it's easy to occasionally lose your temper. Other times you can burst out laughing even when you are trying to scold them because you want them to not do something that is
But really - who knows if each little thing you are doing is right or wrong? Maybe they'll just appreciate the effort...