I am going over seas with school in just over a week, and everyone keeps talking about how much they will miss their family. I can't say that I can even so much as empathise with them, as I have been on similar excursions in the past and have never experienced this; the closest I have come is missing my dog. I'm not an emotional invalid, if anything I'm too sensitive. Is it normal?

Enjoy your journey!
I am from a big family and was never homesick. I was glad of the peace but when people asked if I was homesick I'd say, "Yeah, sick of home!"