If you live in the Northern hemisphere, now is the time to think about getting the flu shot, and making an appointment to do so if you need one. Flu season can start as early as September, and since it takes two weeks to build immunity after getting the vaccine, you'll want to be fully protected during the peak of flu season. You'll want the immunity to cover you through the worst of the season, and many experts say that getting your vaccine in late October is optimal timing to carry you through the winter months. Getting it earlier may allow immunity to wane before flu season ends.
While last year's shot covered limited strains and had lower efficacy than usual, some protection is better than no protection at all. People who get the flu shot and then get the flu usually get a milder version, and are less subject to serious complications like pneumonia. If you or your children are serious needle-phobes, the FluMist vaccine is available again for 2018. It's not been as effective as the shot, but again, some protection is better than none.
Previously-healthy people can and do die from the flu, and the 2017-2018 season had a record pediatric death rate from influenza.
It is not possible to get the flu from the flu vaccine, as the virus is inactivated (and can't be reactivated). What you may experience are flu-like symptoms, which are a result of the immune response provoked by the vaccine - it's still way less severe than the flu, and not life-threatening.
If you have questions about the flu or the flu vaccine, please ask!