I've always had my flu shot as a child, since I was born with asthma.
When I was 10, I outgrew asthma, but still got the shot anyways.
When I was 18, I heard the flu shot was full of "toxins" and decided to skip it that year. I got extra vitamin C. Exercised daily, ate healthy, drank plenty of water, plus I drank a homeopathy hot drink that should prevent the flu. It did not. I got the flu twice that winter. In November and January. I nearly died in January. I got pneumonia. It triggered my asthma to return and gave my fibromalgia. I spend over 400 euro on my homeopath to cure me, only to be saved by my physician.
Don't be foolish. Get the flu shot.