I remember that I avoided vaccine too at that age but only by coincidence,I wasn't at school in that day or something like that and I'm doing pretty well.
The vaccines that prevent Polio, chicken pox, mumps, etc are very important. .In regards to the yearly vaccines coming out with every new flu season. It is best to avoid those. In comparison to the other vaccines which were tested for 10s of years before being released the ones released every year are hastily made. Unless you are a very young child or a sickly old person your body should help protect you.