I told them I had plans of setting myself on fire
I always want to know why people make such irrational poor decisions. Would you mind telling me the reason behind telling them about you planning to set yourself on fire?
Because I feel like the world would be a better place without me in it.
I'm sorry you feel this way about yourself. Have you tried talking to someone about your feelings? I'm sure there would be a lot of people who would miss you if you were gone.
No one would miss me. I can light myself up and fry an egg on my head.
That is terrible for you to say! You shouldn't set yourself on fire. Causing harm to yourself is wrong and it would help you if you found things that would give your life meaning.