Well I had this notion when I was younger that I would be married by 22 (missed that by 4 years) and have my first child by 24 (that's when my mom had me). I will be 27 when this baby is born and honestly as much as we were not really prepared for it, I think in our own little way we were.
I don't think its abnormal to not want kids now, or ever. For me, I have always known I would be a mom (some way-it never really mattered if I had them naturally) but I have always been a very motherly person. My best friend is older than me and she has always said I mother her.
I chose my career so I could be a mother and I think that is all normal as well.