You are not odd. As our children grew up we had a succession of rodents as pets, from mice to hamsters, degus to guinea pigs. My son, in his 30s, now keeps rats which he adores and they help to keep his depression stable as he has to care for them. Sadly smaller animals do not live long lives and often suffer with breathing problems. If you have any animal, large or small, they need to be loved and cared for which includes visits to the vet if they are unwell. Sadly vets are expensive, maybe having an xray on an elderly hamster was a little excessive but who can say? I'm sure the vet would rather you look after your animals well. Don't worry, you are not alone but people who do not have an affinity with animals do not understand.