Is it normal to never feel stressed or am I crazy?

I know it is a weird question lol but everyone around me is always stressed out especially in school, they all freak out about essays, exams, relationships etc. but I never do. And it is not like i'm lazy and dumb, I got accepted in an honours program in university. However the fact that I rarely stress out makes me wonder if there is something wrong with me cause everyone else does and most of my entourage wonder how come I never stress and I wonder why they do... Since read stress is also healthy I was wondering if there is something wrong with me..