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That's a common misperception. There's no legit doctor on the planet who would agree with you. Basically a flu shot will only work against one strain of flu, so you could still get the flu, albeit a different strain. And it may not even prevent the flu the specific shot was created for, but rather lessen they symptoms.

Bottom line is, if entire populations did NOT get a flu shot the death toll each year would be astronomical. Of course, thousands of scientists, research, and history could be wrong and you could be right. Anyway, the CDC explains it better than I can:

Flu Shots
The flu shot uses an inactivated or “killed” vaccine. This vaccine can’t give you the flu. However, flu vaccine, like other vaccines, can occasionally cause a reaction. Feeling some response to the shot is not unusual. The vaccine acts to stimulate your immune system and prepare you to resist infection. You may feel your body's protective activity through mild symptoms. Also, some people may experience symptoms of mild sickness after getting a flu shot, but these symptoms are not necessarily connected to the shot.

If you do experience a reaction to the flu shot, it is usually local and mild—redness, soreness, and swelling at the site of the injection. Usually if you have this kind of reaction you find that it doesn't interfere with normal daily activity and does not make you feel sick. Fever and more generalized aches and pains can occur but are even less likely; those who are receiving the vaccine for the first time ever are most likely to have this type of reaction. You feel the symptoms, if any, within a few hours of the injection. The symptoms typically cause discomfort, not sickness, and last for a day or two.