I had kids. I got a cold every year. That alone, very annoying... in the US.
I got a flue shot every year for 10 years; it helped; I stopped getting colds from my kids.
Still to this day, I no longer get simple colds; when I was getting several per year previous. I did seem to help..
that said, I no longer get flu shots for last 4 years, and I still don't get colds any more.

I absolutely do not trust us gov, and will no longer accept innoculations.