They don't seem to have any problem finding what they're looking for, so why should they settle for a guy like me?
What makes you think they're finding what they're looking for? I think the high divorce stats in this country prove the exact opposite. They're picking the shiny and glamorous, and then changing their minds later on. Then they find themselves 35+, divorced (because they just couldn't stand the guy any more, or he dumped her for some reason), and bitter.
The last thing I want to do is finally land one and then disappoint her.
No offense, but I think you need to work on your self-confidence. This is coming from someone who has his own issues with that, so you're not alone.
and I would be suspicious of their sincerity anyway.
That's very wise. Leaving the country isn't that easy (unless you go to a 3rd-world cesspit), but if you have valuable tech skills it can be done pretty easily.