You might have a defective charger/power supply, or even one that is not designed to meet basic safety standards worldwide. This is very dangerous!
It is also possible that you are sensitive to the low current flow that can result from weak capacitive coupling from wiring to the laptop frame, through you to ground.
If you have a multimeter, measure the AC potential from the laptop frame to a good ground, like a metal pipe connected to the earth.
For a "scorched earth" test, ground the laptop frame to a good ground.This may destroy the laptop and power supply, but also might save your life.