No adrenaline?

I recently tried skydiving for three first time in my life, a tandem jump. To my absolute surprise, I experienced no nervousness, and no adrenaline rush when we jumped I was calm and collected and am pretty certain that I didn't have any sensory overload. I was very aware of everything around me. Is this something that others have experienced? Is there something wrong with me? Also, it might be worth noting that in my line of work I am regularly several hundred feet in the air so heights really don't bother me. I would love to hear anyone's thoughts on this!