Do you think it's boring if Americans never leave the US? I'm American and I've never left the US until I was 17, as I've been to Canada, China, and Hong Kong. I've met a lot of people who have never left the US, and not only that, have never been anywhere further than another state.
Do you think that's boring? It sounds boring to me. It makes sense as many Americans are too poor to travel, don't care enough to travel or learn another language, or just are not interested. Everyone should leave their country, no matter the country, at least once in their life.
My coworker told me he's met some people, mostly young, who have never even left our COUNTY. He said they are mostly poor Hispanic families who struggle to have a meal on a daily basis and don't have a car, and don't bother to go to San Francisco, which is an hour away.