If you on principle refuse to take any medication or vaccine due to the fact that they almost all have rare, unstudied or potential side effects then that's totally fair. The human body is a very complex thing and every single one of us is different so it's basically impossible to truly know if a drug will have no rare side effects for some sub group. Or at least do extensive deep research on every single medication you take including supplements and over the counter things.
If you only do this for the covid vaccine due to reading too much fearmongering then that just means you're irrational.
Look at the COX-2 inhibitors as well. They were on the market for almost a decade before the increased risk of heart attack popped up in the data.