I was going to suggest church, but since you're not religious that's a no go. You could always give it a try though, could be the change you didn't know you need.

(In college, the girl I wanted was a Christian; I wasn't. But being with her changed me, I saw the joy and confidence she had, the solid Christian family roots she had growing up, and I wanted that too. This the whole course of my life, and eventually my family, was impacted by this one individual)

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If you're going overseas for 4 months, there's a good chance you'll meet a foreign girl or an expat. Don't expect them to want kids day 1 though. If they're there they're travelling just like you, not a homesteader on a farm.

(In another experience, I was engaged to a french girl after meeting her in Asia, whirlwind romance and all that. BUT it eventually ended because a) She wasn't christian and swore never to be and b) She didn't want kids.)

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I'm now happily married with kids, but from start to right now it took me 13 years to get here. You'll make it too. Men have plenty of time to have kids, don't think you don't. Good luck 

 I think church could still be an option even if he is not religious. You could channel some personal espirituality and go to church your own way. Everything in life is a trade-off.