Having children changes your behavior. Your personality doesn't change, but you're more cautious of what you say and how you say it to start with-so that already changes things. My mind is not completely mine anymore. I used to be able to concentrate and achieve things. Now I find it much harder to focus, because it just seems that half your brain doesn't belong to you anymore. My kids are still little. Maybe it will change more when they're older, but I doubt it.