Here's my thought based on some observations and data -

In Nepal, female to male ratio, within the age group of (25-35) years, is ~1.3
Assuming same ratio in the US one would expect there's a good chance of finding a partner, but not necessarily a match. Still makes most of us happy !
However, that's not the case. In Nepal, literacy rate of male is almost twice than that of female, cultural and socioeconomic dynamics another factor, including many other factors dictate immigration. And ultimately male/female population in US for the same age group of (25-35) years. There must be data somewhere, but for all intents and purpose same conclusion is still valid - male to female population ratio, of the same age group living in the US, is greater than 1. Note, this is quite the opposite from Nepal.
Simple supply and demand rule will exactly bring us to the topic of your discussion. Demand for female is unnaturally higher, so if you look around and even far within US it seems hard, specially if you've some set criteria then good luck !
So, it is not just you.
There are some matrimonial sites and bureaus in operation, but again for reasons already stated above and for some unknown reasons, there is no need whatsoever for a female to advertise herself using such platforms. That said, I still think there's a need for "one" exclusive platform, more legit, more personalized which can draw attention to majority of single population, enable network and connection.
This issue is also sort of natural in a sense that we chose to migrate and live in a foreign nation, hence the consequence.
Keep looking !