Usually at this age teenagers (or boys atleast) don't want to even think about having kids. And I'm the same. But there is one difference, one motivating factor, that makes me feel I must have children: The world needs more Jews.
Simple as that. I have the chance to put 1, 2, maybe even 3 more representatives of my people into the world, and I need to take that opportunity.
Problem is I need them to be good representatives or else all that effort is pointless, and that means raising the little bastards...Oh well. I'll get through it.