There is more than one Covid vaccine and they don't all work the same way.
Talk to your doctor regarding possible side effects that might be more relevant to your medical history and then make an informed decision. Don't just go to a parking lot and jam the thing in your arm without a talk with your doctor first.
Overall the risk of side effects is overblown though. There are side effects like with all drugs, but the occurrence of serious ones isn't particularly high. Catching Covid itself is by far more dangerous than any of the vaccines.
There are many anecdotal stories of serious side effects, but the statistics don't bear out any particularly high risk. Ivermectin has serious side effects too by the way.
Also you should consider why you take it. Just to protect yourself or because you want to do your social duty, protecting the vulnerable and the elders who raised you, maintained and build the country you live in? Maybe you don't need it, as a healthy young adult, if you don't care about the latter. But I personally do care and took the moderna vaccine for that reason.
My shoulder was swollen a bit for a day or two and I had mild flu symptoms. That was all.