I have not seen enough research to conclude that all vaccinations are potentially deadly, and in my experience, they seem to work.
Aside from that, I already made it known to my mother that I do not wish to be vaccinated, but she insisted it so I went along with it.
How young are you?
Well, I refused the H1N1 but received the normal flu vaccine. I don't think that its a big deal. At least not a big enough deal to get into an argument over. If one of my parents were to tell me to apostasize or attend non-Catholic worship then I would refuse, naturally, but this doesn't even amount to something like that.