Rarely, i get sick- chills, body aches, headache,feeling unwell, nausea.but i never get fever-not in 7yrs.why is this? my temp never goes above 97.9!

Lucky you: You have been relatively lucky that you haven't had a fever in 7 years. There's no need to be concerned at all, it simply means that you haven't any nasty infections which your body has needed to fight off by mounting a fever response.

Normal. : Normal. Not everyone mounts a fever. If you're really curious measure your rectal temp, it will likely be up when you have an infection.