I’ve been so annoyed with children

Granted I am a FTM—so I can’t relate yet to the “kids just being kids” yet. I have never had children (younger siblings but I don’t considered that to be the same) or really have ever interacted with children (but I have never felt bothered or annoyed by them) and now children are annoying me. At my baby shower, I wanted to lecture and bad mouth my two young cousins because they were making me mad with how annoying they were. I seriously hope this is just all part of my moodiness/emotional changes, but children and I can’t be in the same room right now. It’s like I stoop to their level, a child mentality...wth!