Point is, just because my experience with the vaccine was fine doesn't mean everyone's would be, and just because your experience with covid was like a mild flu doesn't mean everyone's would be. The rational thing to do is to weigh the two risks. And the evidence so far shows that the total risks of covid, even for a young, healthy person, multiplied by the likelihood of getting it, do outweigh the risks of the mRNA vaccines.
For children it's probably closer, at least in terms of acute risks. I expect the risks of chronic complications from covid are still enough to tip the scales, but I could be persuaded otherwise with more evidence. But you have to be willing to consider the evidence that exists, not just that which supports your priors.