You didn't miss shit, you've got the best of both worlds in front of you now, a body that still functions well and a brain that's beginning to function.
LOL. That's funny and true.
To those who are just starting out like me, I have noticed that first few days seem like one has to be a superman to snowboard. As a scared beginner, a common reaction is to tense up all the muscles and joints, so one would get tired very quickly. Once one progresses the efficiency improves rapidly and snowboarding suddenly becomes much easier.