Flu shot

What is the significance of the flu shot? I mean really you are giving me a needle (ouch) and infecting me with the flu virus so, I won't be sensitive to it. Well I'll say this In the past three to four years I have not gotten the flu!! The flu has been absent from my body for quite some time. I do not want to go get infected with this flu virus! But since I am a nursing student and we have to make sure we are immune to these horrible diseases, I have to go get my shot. Watch I'm going to get sick because of this. My day off school on thursday will be ruined because I will be sick, because of this stupid shot. Oh you will so hear about it, if I get sick. I will be complaining like no other! yeah, so I get my shot tommorow, at like ten. Let's hope nothing happens to me!