The constant lies about the so-called efficacy of the vaccines, and the fact that they are perfectly safe, when they aren't? And let's not forget the complete propaganda from the CDC/WHO as if they were the only ones allowed to talk about vaccines.
But that doesn't explain why you don't trust them.
You're using the fact that you believed a lot of anti-vaccine arguments as support for why you... chose to believe a lot of anti-vaccine arguments.
Are they all populated exclusively by anti-vaxxers?
I dont consider these shots to be "vaccines" (if those are vaccines than aspirin is a vaccine as well, words don't have any meaning anymore), so you can already drop the anti-vaccine etiquette.