You'll be surprised how many younger people feel similarly, from various age groups (and, thus, with differing nostalgia). That realisation that what was new and exciting when you were a kid is now considered 'old hat' can catch you off-guard at the worst of times. There is no easy solution, especially when - as you say - you grow attached to how things were. I don't really know what else to say, I'm afraid...
You'll be surprised how many younger people feel similarly, from various age groups (and, thus, with differing nostalgia). That realisation that what was new and exciting when you were a kid is now considered 'old hat' can catch you off-guard at the worst of times. There is no easy solution, especially when - as you say - you grow attached to how things were. I don't really know what else to say, I'm afraid...