I think international travel is probably more frequent for non-US citizens. We have 50 states plus some territories like Puerto Rico, US VI, etc that we can visit in a very large country with tons of varying geography, climate, people, cultures, etc. There are tons of states I've never visited and many cities I would still like to visit. I only get so much vacation every year.
Yes, other countries have cultural diversity too, of course, but also US Citizens grow up with a "USA #1! USA! USA!" propaganda beaten into our head. It's extremely common for US Citizens to not even have a passport. US Citizens are just far less likely to travel internationally than those from other countries, it's sad to say.
I think your travel is probably perfectly normal and nothing to be worried about. I was only worried about travel to stamp mismatch.