Can somebody please tell me what is the most painful way to kill

The most painful? stab yourself slowly in the place where one of your lungs should be. You'll be screaming for hours until you die.

Inject yourself with a large amount of platypus venom. Non stop excruciating pain. You'll probably die of exhaustion due to lack of sleep.

You could skin yourself starting with your arms and legs

Step on a stonefish. The pain has been compared to having boiling water pumped into your veins.

>>17003936
Self immolation. Do it on a public place.