help. ugh

Maranda
Please don't judge me on this but has anyone ever felt annoyed by other people's kids and when they have to babysit and then yet want to get pregnant so bad? 
Like I keep thinking how bad I want a baby how bad I want to be pregnant but I'm scared that when it gets to a certain age I'll be annoyed by it or I won't want it or that I'll be a bad mom. Is this normal or am I horrible person?