This is from a preprint study from the University of Ottawa Heart Institute, and it has concluded that the prevalence of myopericarditis as a side effect of the Covid vaccine is 10 in 10,000, or 1 in 1,000. It is way more prevalent in males:

Given that well over 90% of the patients in this study were male, it’s safe to say the risk of developing myocarditis, pericarditis or myopericarditis (a combination of the two) is significantly higher than 1 in 1,000 for males.
Also: a median age of 33!
As I keep saying: whether or not to get the vaccine is a matter of weighing the risks and the rewards. What are your odds of dying from Covid? What are your odds of developing heart problems after getting the vaccine? Are you healthy? Do your preexisting conditions (i.e. obesity, diabetes, etc.) elevate your risk of dying of Covid? People need to take all of this into consideration.
We’re all under immense pressure to just get this vaccine and stop thinking for ourselves, but really it’s a matter of risk vs. reward. There are risks that come with taking the vaccine, no matter what anyone says. Do those risks outweigh the rewards? That’s the question people have to ask themselves. It’s different for everyone.
Myocarditis does not have a good 5-year survival rate, either:

44% survival rate after 5 years. Yikes.
Just yesterday, the FDA Panel that rejected the White House’s booster shot plan discussed the risks of developing myocarditis as a result of the vaccine:
Essentially what the FDA is saying here is that if you’re a male under the age of 40, you’ve got a greater chance of developing myocarditis due to the vaccine than you do of dying from Covid.