missing my kids

It took me 5 days before I actually started missing my kids. I have been away for 5 days now, and only today do I actually miss them? Does that make me a bad mom? Today, a young 23-yr-old reassured me that no, it is not good to be too crazy for my kids. And she is probably right. But I still feel guilty when I think that I am just about everything to them, and they are not everything to me.