> Vaccines work by stimulating one's immune system response in ways similar to infection
Wrong. This is not how the MRNA vaccine works. The only thing that the MRNA vaccines produce is the spike protein, and it's bound with an additional part so that even the spike protein can't be active. It doesn't deliver the same immune response as it does from a COVID 19 infection at all.
All of which doesn't answer the question why are 12-17 year olds suffering a 1 in 5000 chance of getting myocarditis from the vaccine?