1) What about your friend's and coworkers' toddlers, grandparents, etc.? What about society in general? Herd immunity and helping stop the spread of disease is a good thing.
2) Actually, it might kill you. In Alberta this past season, we've had a strain of H1N1 that reportedly hits people in their 30s, 40s, and 50s harder than seniors, with a number of deaths. GlobalNews article
3) Even though you'll probably live, it still sucks to get the flu. Personally, when I weigh getting the shot against a somewhat higher chance of getting the flu, I'd rather get the shot.