Plays Well With Others...
To those who say they can't afford to travel, I say to you: stop making excuses. If you've got the income and leisure time to be spending time reading this blog, are sufficiently motivated, and make it a priority in your life, you can certainly afford it.
 This is the big sticking point for most people, I think. If you choose to have a family or focus on your career or pursue a costly photography hobby, you might not have the money or flexibility to travel this way. But that's a choice you've made (on some level)...and I would argue that if you're 30 years old, you can arrange to make an overseas trip once every 3-5 years, and that's about 7-8 trips by the time you're 60.
People always say to me, "Wow...must be NICE to be able to travel so much," like we're independently wealthy or something.
Actually, we just make the conscious decision to travel and plan accordingly. It's a lifestyle choice, just like anything else. Some folks have kids, we go to Hawaii for ten days every year and have plans to do things like go on an African safari, or eat sushi in Japan in the upcoming decade.
When people used to ask my husband and I what our long-term goals were, they always involved travel. That should have been indication enough to most people that kids weren't one of our long-term goals. ;)
After reading this I want to drop what I am doing and leave. But like you, I have certain limitations holding me back.
I have been to more countries than I can remember, but it is never enough.
You should go. I don't know if you have anything else holding you back, besides what you listed. But two cats, and some anxiety about sleeping arrangements is not a good enough excuse.