That you are still you, if you love spending time alone pottering or watching TV you will probably still crave this once you have children, only you won't be able to do it as much. It's not a reflection on your abilities s a parent to still enjoy the things you enjoyed before. I crave free time from DC, it's not about them but it's what I enjoyed before they came along.
As a pp said, compassion. I think I was compassionate before in that I felt healthy levels of empathy but now everything involving children hits me straight in the guts. I try to donate to my local baby bank because the thought of any baby going without upsets me. I watched a holocaust documentary and was nearly sick seeing the women and their babies arriving at Auschwitz. I studied history so it's not something I've not seen before but this time I saw my baby in their babies.
That it's impossible to understand until you are a parent. People who do not have children often think this is a bit of a twatty thing to say, as though they can't imagine and empathise but it really is something you have to experience to understand.
That a lot of my pre DC opinions about children and parents were utter bullshit. Quite frankly I don't know how some of my friends with children listened to me.
That the person who has cut me up in the car might have a screaming child on board (I've been that person) so give them a break.
That one day I'll be an old lady whose children have grown up and built their own lives, that I'll likely be alone and I'll look back on this and do anything to cuddle their pudgy little bodies again.