What do you think about me wanting a terminal illness?
What do you mean right now? Why would you want a terminal illness?
I want to see how people react to terminal patients, I want to know what would they do if I get sick.
Interesting, but ultimately the disease would kill you. You can study how people react to existing terminal patients to learn that.
Life is meaningless.
If you really feel that life is meaningless, then it seems like you're suffering from some sort of depression. You should seek therapy to help fix these feelings that you're having.