How do you know if you want children?

Hello ladies :-) I know some women know from an early age that they want to be a mother. I always thought I wanted children too. I am 25 now. I have no children and I just don't know if I do or don't want children. I don't know really. Is there anyone out there that felt like this and then did have kids? I am looking for any and all opinions! Everything is appreciated :-)