At your age, there are plenty of childless men; you just have to look in the right place. (I suggest a college campus, or, naturally, a church.)
Generally, STEREOTYPICALLY speaking, people who are raised to not be sexually promiscuous (church) are not going have kids, since they aren't doing the baby-makin' dance. Similarly, someone who is career focused (college) is going to be doing whatever they can to avoid having a major direction change in their life until their training is done and their career path is set. After 25, however, having a year or two career experience (and real paycheck), young professionals are far more likely to procreate since their parh is set.
Remember, this is a broad generalization, but stereotypes exist for a reason. There are lots of exceptions, be it by choice or by accident.