when I was younger, I really wanted a motorcyle. I rode one a few times, and it was a huge blast. then I had a friend, who was one of the most competant people I knew with physical activities and very cool headed, get into an acident that put him in the hospital for about 6 months and left him mildly handicapped. he had been doing everything right, but a car had tapped him and pushed him over. nothing that he could have controled
and that convinced me not to do it.
the big problem is that you have no control over what will cause the problem, the cars do.
that said - hey, you don't have any responsiblities yet, do you? so, if you get squished under a truck, who is really going to care. live a little.