There is nothing cruel about not wanting kids. It is a personal choice and don't let anyone tell you differently. I once worked with a guy who asked me to marry him, jokingly of course, because he didn't want kids and I mentioned that I didn't. One of my co-workers and her husband never wanted kids and they are in their 40's so that is not going to change anytime soon. Guys like this are out there.
The world is so over populated and if it keeps growing at the rate it is we will run out of food in the next couple hundred years so people like you should be applauded and not ridiculed.