You were kept safe by heard immunity as the people around you were largely vaccinated. Vaccines are not harmful (outside of allergic reactions). Fluoride in the water isn't "extremely harmful" either, and its presence is by and large responsible for the drastic improvement in the quality of peoples teeth in the developed world.
Whether or not you never got sick as a child, has nothing to do with your vaccinations as those common sicknesses were not protected against by vaccination anyway.
"heard" [herd] immunity is just another way of admitting that vaccines are only maginally effective. If they're effective, you're protected. If not, then you can run around doing mental gymnastics blaming it on everyone else. Measles outbreaks routinely happen in 99% vaccinated populations.
Sodium Fluoride and fluorosilicates have been used as pesticide for over 100 years. But I'm sure it's just in the water for your teeth.... Kind of like you drink sunscreen to protect your skin from the sun.
My spelling needs work. Herd immunity is the mechanism by which vaccination attains its effectiveness, they are notably only truly effective when everyone is vaccinated. This is why people not vaccinating their children put everyone elses children at risk. It only takes one weak link to break the chain. The human immune system is only so good. Its not like one becomes a super hero against a foreign agent just because of some antibodies. Even in a fully vaccinated population it is possible to contract the disease you are vaccinated against, the likelihood will be small, and its spread will be minimal due to herd immunity. It's just how biology works.
Sure pesticides, okay. It's all a matter of concentrations. A lot of things could be used as pest control in the correct concentrations. Well what else is it in the water for? Mind control? Perhaps it convinces us all that the world in round.
How old are you?