Am I supposed to want kids?

So here's the thing. I know I want kids. One day...before I die. I know I should want kids...continuation of the genes, family, the miracle of birth and all that. But I'm not really interested in other peoples kids. My friends have kids and I'm interested in them, but only because of my friends. I'm not interested in random kids. (Not that there are random kids, but you know what I mean). I'm not trying to be mean or cold. Sometimes I find kids really,really annoying. So am I just not cut out for kids? Should I still have them? Will I want them more later?