I usually exercise 6 days a week, sometimes 7... I'm basically a gym junkie too, I'm hooked on exercise. And cos I'm a personal trainer I need to keep up and improve my fitness at all times, so I guess that's another reason! I start to get really edgy and crabby if I don't get to exercise, kind of like when people quit smoking!!!!
But you are doing great exercising as much as you are, just think - some people don't exercise at ALL! You need to do however much you can, and if your body is responding to it then that's great! You may find that you want to do more when your body is more used to it.
I wouldn't worry about what other people do, just keep doing what works for you